Sorry I realize it's been a long time since I've posted anything, been dealing with some stuff. It'd be great to hear an update.
I also have some advice. If you feel weak and think you "have to" use again and just can't convince yourself not to (don't feel bad if it does happen, I'd assume this happens to anyone who's dealt with an addiction at least once, I know it's happened to me more than once) use regular amphetamine instead of meth. From what I've read meth is far more neurotoxic than regular amphetamine and wreaks havoc on the part of your brain that produces serotonin which will most likely make the depression after quitting more intense and last much longer. Not saying that the doses of 0.5-1.2grams of speed you said you took weren't neurotoxic which just taking an educated guess I'd say they were (I'm no expert), but generally speaking meth tends to do more damage than regular amphetamine not to mention the increased addiction potential due to it's various ROAs (again I'm not an expert and I've never even tried meth or plan on it). I'll admit I have a bit of a prejudice toward meth because I've seen the physical damage batches made by idiots who don't know what they're doing caused people along with the monster it turns once good people into after the addition traps them in its jaws, I've actually had many acquaintances and even quite a few family members (luckily not my parents, I couldn't even imagine growing up in that) who had their lives ruined and/or ended by meth. It turned them into miserable shells of human beings who would lie, steal and probably kill if it came to it to get their goddamn fix, only two out of about 20 people i knew of got and stayed clean, one is in prison for multiple reasons most if not all of which came from attempting to get his hands on more meth and as far as I know the rest are dead or in some dilapidated meth den spending every cent they get on more while slowly wasting away. No offense to anyone who does meth, it's your choice but just don't let your decisions hurt other innocent people. I realize some people are able to use it somewhat responsibly and have the will power to avoid addiction.
Also if you don't mind me asking what ROA did you use for the speed (snorting, eating, IVing, etc)? Sorry if you already said, I was too lazy to go back and read it all over again.
I also thought of several drugs that might be very helpful but idk if they're available in Germany (don't keep up with the German pharmaceutical markets lol). First of all Wellbutrin (bupropion), which is a mild stimulant that is commonly used as an atypical antidepressant ( if I'm not mistaken it focuses on noradrenaline and dopamine, which are what become depleted after amphetamine abuse) it was originally (and still is) marketed to reduce or eliminate cravings for nicotine. I personally don't know if it works but I've heard of it being used off label for cravings/withdrawal for stimulants other than nicotine, ranging all the way from caffeine to coke/crack and speed. So it's worth thinking about, even if it isn't effective at stopping the cravings it should work great for depression (one of the best antidepressants on the market imo and I've been on just about every kind out there.) Drs (in the US at least) tend to give it out without hesitation especially if you're a smoker and have depression, if not its dirt cheap to buy on the street. Now you'll probably hear about using it recreationally at some point so I'm just going to go ahead and tell you to get that thought out of your head! I can tell you first hand it's awful, not a good high but still super addicting for some reason, burns worse than anything I've ever snorted in my life, completely cost me my sense of small in one nostril made me think I was gonna lose one eye because it burned so badly behind it making it water almost nonstop for days, causes nosebleeds so bad it'll freak you + anyone around out and hurts for days because apparently the assholws they put citric acid in. That was just my personal experience but it can also cause seizures that can be fatal at high doses and if you think of IVing it just take a quick look at people who did on google images and I can almost promise you'll change your mind (and probably puke) some look about as bad as krokodil (or however that's spelled). Also speaking of nicotine I personally find it great for milder cravings, but I wouldn't recommend this unless you already smoke because even if it seems better short term the long term damage will can possibly be as bad or worse for some people (yeah I know I'm a hypocrite lol.)
If you feel that you still need a stimulant to function maybe try Ritalin or something similar I can't remember the generic name off the top of my head. It has also been used successfully off label for stimulant withdrawal + cravings. It's not an amphetamine but it is very similar, it's potential for abuse is slightly less and as far as I know isn't neurotoxic until an ungodly amount is consumed.
Btw in the future don't lie about your doses (or anything else important) it can make it more difficult for us to help in some cases. If that sounds like I'm angry or something I apologize cause I'm really not, I just wanted you to understand that there's no reason to be insecure when you post as long as you stick to the rules. I think I speak for all (or at least most) of us here on the forum when I say we aren't here to judge you for your mistakes, we've all done stupid stuff at some point, our goal is to offer help to other members when they need it.
Once again good luck!