I'll be completely honest with you, you're definitely not fucked. The only problem I found when I did the same as you is everything went well and I got down to a bag in the morning and a bag at night. But everytime I got down that low some crisis would occur that I hadn't anticipated and I'd need an extra bag that day just to get me through. Sometimes the next day I'd feel like shit that I'd increased my use and that would make me feel bad, and yes you guessed it, I'd need an extra bag to get through that feeling. Plus you never know the potency of what you're using. One day you can score and a bag split in two would be enough as it was really strong gear. Another day a bag would barely touch me as it was really weak shit.
The other thing I didn't factor into the equation was what do I do when I get down so low and I have to jump off. That was the hardest decision to make in my opinion. I realised that before trying again I needed to make sure I had a plan of action. Such as people or places I could go if I was feeling vulnerable and wanted to use more on any particular day. You know this is possibly the most crucially important thing you'll ever do in your life. Now you wouldn't consider buying a bicycle without testing the tyres, break, the gears and taking it for a test drive. How is this more important than what you're doing now? Have you considered seeing what's available on your location that can replace the heroin. Something that eases the withdrawals a little cos there are going to be some withdrawals when you do finally jump off.
I'm sorry if you've heard this before but it's the truth as I found it. I admire what you're doing so much, it takes a special kind of inner strength to get to the point you're vat. Just don't forget how much you want this as you must really want it to do it this way. Just one other thing keeping a diary/journal can help. If you're struggling looking back just 2 weeks and you might find that actually you're doing better than you were then. You can also see patterns that might help and things you need to avoid.
But never forget that s lapse/relapse, if it happens, is only a mistake if you learn nothing from it. Learn something and it ceases to be a mistake and becomes a huge learning curve. I've never got it right long term by getting it right, but I've learned big time from getting it wrong.
If I may ask have you addressed the issues that started you on your drug using adventure? You see in my own experience I've generally found that anyone using heroin has some kind of emotional pain that the drug eases. And if you're one of those that didn't start of with any emotional issues I imagine you have some now. You know I've always thought that addiction is just the symptom of something that goes deeper. If that's not addressed then you could be looking at another addiction taking it's place. I apologised if anything I've said is not what you, or others want to hear, but what I'm saying comes from my own experience but mostly my heart. You know the reason it's called a "habit" I'd because it becomes the routine you follow without thinking and even after stopping completely it takes time to gradually change your daily routine, the way you think and how you deal with life when it hits hard. You don't become seriously addicted in a few weeks to the point where it becomes that habit, so you can't expect to change back to where you were before you began using in a couple of months. When you start using heroin it changes every part of your body and with the chemical changes that also occur you end up with a lot of learned behaviour that has to gradually be in learned. But you've been brave enough to reach out for help, that takes courage. I'm so proud of what you're doing. And in a way I'll be reading how you're doing and in a way taking this journey with you. One thing I can promise you is that when you become heroin free and you've got through the first couple of months afterwards you begin to see, feel and think differently and it can be the most amazing feeling in the world. Obviously you still got to deal with life which has it's shit days. But in comparison to the shit you felt a few months before it's still the best option being heroin free. There could be someone reading what you've written thinking of doing the same, and due to your actions are inspired to do the same. And someone considering starting down this road could read your post and decide after taking this journey with you decide it's just not worth it. So you could say you're taking this journey so they don't have to. That's the best thing you can do for anyone in my opinion. So well done sweetheart.
So I've stopped using and started back up many times in life, usually because of jail. But the last couple times I stopped without being arrested. My longest clean time just a year ago ended with 1000 days clean. I got out of prison,l and then the halfway house and stayed clean for a while. But then I had a miscarriage and I spiraled.

It is what it is. I got clean twice between when I started using again a year ago and now while at home, using subs. The first time for some reason wasn't that bad of a withdrawal even though I was using for like 5 months. The next was terrible even after a couple weeks. And this time, just like you said, I get so close to doing almost none and then something happens, I make some excuse that I need and extra bag or two, and then I'm back to where I was trying to get down from. I just got a bun, used two bags already, but am trying to only use when I start feeling really close to sick. Like, pupils huge, body zaps, cold sweats just starting. Because if I just use whenever I feel like, I'm going to go through this bun way too fast. I have suboxone, I honestly don't know why it's so hard to just go the day or so of being sick and take a sub. But I find that the main reason I use isnt to numb emotions ( even though yes I do do that sometimes, but it isn't the main thing that I crave). The main thing that keeps me using is that rush I get when I shoot up and I feel it in my chest and through my whole body. And what I keep thinking about is, how do I replace that feeling that I enjoy so much? I know some people say that you just have to figure out what you like about it and find a healthy way to replace it or cope. People that use it because of an emotional issue can get help from therapy or journaling or talking to people, some people that use it to sleep can get sleeping meds, etc. At least that's what they taught us in the TC program in prison

. But how do you replace the feeling of that rush that feels so good it's almost orgasmic? Or the excitement I get from pulling back on the plunger of that needle and seeing the blood flow in and knowing that the wonderful orgasmic rush is soon to follow? Someone tried to tell me exorsizing gives you the adrenaline rush that's close, but not for me. I'm not really into exorsizing and it just makes me tired. It's good for keeping in shape and being healthy yeah, but it's not the same feeling. And it's a lot more work that just grabbing the needle and dope and shooting.
Anyways, I'm going to try to make this my last bun. I've said that about 5 times this month and kept getting more. But honestly, I'm out of funds and out of meds to trade to my dealer. So I don't have much choice. The only thing I can do is do my best to ease into the withdrawl and taper with the 8 bags I have left. Thankfully I didn't let my habit get too bad. I kept it low because I knew if I started doing multiple bags at once, it was just going to make the withdrawl that much harder. I do one bag at a time, but I usually do it many times throughout the day. Because I like that rush and the whole ritual of shooting it. But I'm gonna use some restraint and only do it when I NEED it instead of when I want to. Hopefully. I have subs now so that's the plan to ease the withdrawals when they do come on. I also have a couple Xanax, clonidine, Ambien, and one other pill I can't remember what it was.
I appreciate you answering so much and everything you said was helpful to read. And while I didn't plan to use this thread as a journal exactly with updates on how it's going, maybe I will. It might help someone later on that's going through the same thing I am. You're so very right about that lol. I shall update as I go. As long as I remember lol.