Zonx, I will be blunt here. You are just progressing through all of the well-known and well-traveled roads leading to complete unfunctional addiction. This doesn't imply that you're weak or stupid. As human beings, we often lie to ourselves to protect our sanity or to maintain our self-esteem. We think of all of the myriad ways that we can consume drugs all the time without experiencing addiction. There has to be a way. You'd be surprised how many utter street junkies consider themselves to be "functional".
We all want to feel good all the time. I don't know of anyone who doesn't enjoy fun or good times. Opioids are literally happiness. It's what they do. It's natural after experiencing such ecstasy to want to repeat the experience. You are beginning to question now why you even bother moderating at all. This will lead to "doing a little extra" tonight as a treat. This leads to morning desperation and a reinforcement of the animalistic urge to once again experience contentment.
Thinking that you are different or that you might know the "secret" to maintaining normalcy is a pitfall that most of us find ourselves in.
This man speaks the truth.
OP you really need to get out of this mindset altogether if you wish to stay functional. You can't really be 100% functional even if you do manage to moderate your addiction simply because your mental focus is still primarily on the drugs above all else in life.
To use an example from my own life: I was stuck in a shitty dead end job and just did a fuckload of oxy and benzos every day to numb myself to how depressed I was. I temporarily felt better until tolerance hit me and I had to keep upping and upping my dose just to stay well every day. Eventually I wasn't even getting high anymore, this was just my routine now. This happens to fucking everyone because you can't stop tolerance.
People around me started to notice I was acting funny even though I thought I was still acting perfectly normal. It really hit me when my family saw me and was genuinely concerned about me overdosing because they could tell I was just fucking mashed on fuck knows what.
That was a real dark time in my life even though I would have refused to admit it to myself at the time since I was "just having fun popping pills" in my mind. If you asked me I would have said I was perfectly functional even though I was anything but.
Anyway long story short I tapered myself off the oxy for good and still have not touched the shite since. I'm now back to doing benzos only at low therapeutic doses - and I do mean low doses like 0.5-1mg alprazolam or clonazepam.
Since I stopped using drugs as my only form of happiness I focused on fixing my real life instead and am now in a proper job and am much happier with myself. No longer depressed as most of my depression in that instance was situational.
If that hadn't happened fuck knows where I'd be now. At best, in the same place as I was, depressed and hooked on oxy while my life never gets any better. At worst I'd be dead.
When you're dealing with opiates you can't really stay functional if you're hooked on 'em no matter what you may tell yourself at the time. Anyone who has quit a habit can tell you that. You look back and realise all that time you thought you had everything under control, you just didn't.