I had typed up a big response earlier and something happened and I lost it all... I hate that...
Anyway, 3 inhalers of propylhexedrine is a LOT, especially every day. Honestly I think you're causing yourself a lot of damage, you should do whatever you can to cut that shit out. Stimulant abuse takes its toll, and all that camphor or menthol, whichever it is, isn't good to ingest either. I use p-hex pretty regularly, more than I should, I get the draw, but I use it up to twice a week at 1/2 an inhaler. I used to do a full one but it just takes too much out of me.
One time I took 2 inhalers at once, it was the second time I tried it. I definitely experienced psychosis to some extent. I took them at work, and the first thing I noticed was that all smooth black surfaces looked like smoke was wafting up over them constantly. Then on my 45 minute drive home, I kept losing track of myself and thinking that the passenger car seat was my then-girlfriend, who was out of town for a week 9and I was alone in the car). I would start laughing or responding to her, as if we had been having a conversation, and then suddenly I'd realize I couldn't remember what we were talking about. And then I'd realize I was talking to the car seat. It kept happening over and over, every few minutes. Once I got home, I was seeing shadowy cloaked figures out of the corner of my eye, and they'd always be rushing at me and about to hit me, it was so terrifying for a split second every time. Also I'd hear voices coming from downstairs, but by then I was pretty aware of what was happening and didn't think there were really people down there. I've done a ton of drugs, but the only time I've experienced psychosis like that was on propylhexedrine, less than the amount you're taking every day.
There was a guy on here who was claiming to be taking 10 inhalers per day... but 3 isn't good. Taking any monoamine releaser every day is bad. Propylhexedrine is a triple releaser which means it releases dopamine, serotonin and norepinephrine, so it depletes you quite a bit especially over time.
I took it 2 days ago, 2/3 of an inhaler and it took me a day to recover. I just threw away the rest of it, thought about taking it today, part of me wants to, but honestly I don't have a good feeling about p-hex long-term and it's been years I've been using it on and off. But I've never used it nearly as heavily as you. The next day after using it I'm always like, ugh, makes me want to throw up thinking about doing it.