The last time I was in stimulant psychosis a few months ago for a day or so was when I overamped. I remember sitting at my table facing my wardrobe and distinctly seeing a person watching me from inside, as well as hearing radio music playing from my air conditioning (this is my typical first sign of psychosis) and also ants crawling up the walls.
Fortunately, as my drug and alcohol social worker once said to me, I have a remarkable ability to be able to stay incredibly calm during these episodes of psychosis as I immediately go 'ah, this'll be the meth I've been taking for a couple of days' and then I just ignore the hallucinations until I go to sleep, since I know they will disappear by the next morning.
The hallucinations are largely a result of sleep deprivation combined with stimulant use. I'd been awake from Wednesday till Saturday and I go into mild psychosis without fail by day 3, so day four I wasn't having a great time.
I just turned away from the wardrobe and faced in the opposite direction, and kept reminding myself that I didn't have an ant infestation, I was hallucinating because I'd been awake for 4 days and done a over a gram of meth. It's a natural consequence of the choices I made.
Knowing it goes away following sleep helps keep me calm. That may be something to remind yourself if this happens again.
I find listening to music helps drown out the sounds I hallucinate so I put on my noise cancelling headphones and listen to something relaxing.
The first time I got psychosis real badly I'd been up for a while, 5 days I think. I started seeing the shadow people and realised what was happening and took some Seroquel to shut it down. After that, I stopped binging for more than 2-3 days (this was during my period of heavy use in 2017).
Unfortunately, my experience with stimulant psychosis is that once you experience it for the first time, it's going to keep happening to you whenever you use and hit your threshold. That's 3 days for me. Your milage may vary.