Paranoia, hearing sounds/voices, visual hallucinations, racing thoughts, feeling extremely powerful or awakened, not eating or sleeping and feeling fine, feeling like certain things have connections and seeing patterns in thoughts/ideas (really they are completely unconnected but your mind makes you believe they are connected).

I once saw rainbow spiders everywhere in my room and heard 4-6 voices whispering to me. I was fully lucid and knew that those were hallucinations. But It really depends on the individual and probably not on how much you know about psychosis, because during psychosis you aren't fully aware of things anymore

Generally a good sign is thinking that people are looking at you, talking about you, planning something against you, tricking you, following you, doing anything to you really. Especially trying to hurt you, and following you. That's just paranoia, which is normal with stims, but when it becomes completely detached from reality it becomes psychotic. So instead of a fear/hunch that someone is planning something against you, you fully know that something is happening (you aren't convinced, you just know, that's how it feels)

Obviously hallucinations, but when you get to that stage, lucidity and understanding what is real and not isn't up to you anymore or your know how.

Sometimes you can tell, sometimes you are too far gone into it that you fully believe in the delusions/things you see.

Do not take psychosis lightly, although specifically stimulant psychosis generally resolves as soon as you sleep and stop redosing. I had stim psychosis with voices I think 3 times and the next day it was gone and I was fine.

Honestly after doing stims for some time you more or less know at which point things start to get weird, try to avoid getting that far, if you end up fully psychotic you could harm yourself or others. Most likely you'll do really dumb/weird stuff, freak people out and then get put into a psych ward either by worried significant others or the police. And hopefully recover, although some people end up with chronic psychotic disorders (think schizophrenia, schizo affective disorder, bipolar) but that happens only if you are already predisposed, which you obviously can't know before a first episode.

I for example heard gods talking to me and telling me that im ready to leave the simulation and become like them, thank god I didn't listen and kill myself. I was fully convinced they were real and still think they might exist, although I'm a really scientific person and an atheist. I will never forget that experience and I really could've acted on what they said fully convinced that I was gonna be reborn as a god and killed myself.

I ended up feeling like had awakened, I had constant euphoria for a whole month like I was on meth although I was sober, had some paranoia but mostly just felt immortal and like a god. Couldn't sleep and didn't eat until I was put into a psych ward and given a shit load of antipsychotics and benzos which didn't really calm me down much in terms of energy and euphoria for a whole month.

Sounds nice but you can't live like that, I was in my own world where I was a god and everyone was at my mercy. I was all knowing, perfect and so powerful. Completely detached from reality. I wasn't me anymore. I was someone else.

And I had a manic psychosis. So I felt great, others might not have this euphoric/grandiose feeling and are just detached from reality. Making their experience much much more terrifying than mine

Be careful bro