What types of symptoms would you personally say you have experienced?
There's a big difference between just having some psychotic symptoms e.g. seeing, smelling, feeling, hearing something that isn't there, and having full blown break-from-reality-and-rational-thought psychosis.
Both of these things can be brought on by all sorts of problems, whether they are mental illnesses (e.g. schizophrenia), nutritional deficiencies, medical problems with organs, sleep deprivation, drug use, etc. There are many different mental illnesses which have psychotic symptoms or which cause psychotic episodes.
I've had one psychotic break, which lasted about a couple weeks. I think the psychosis was brought on by a combination of trauma and sleep deprivation. Starvation/malnourishment could have also played a role. It resolved after seeking treatment at a hospital, by which point I was having hallucinations, mainly audio but also visual. I also had strong delusions, paranoia, bouts of depersonalization and dissociation, and my thought process was extremely messed up. That was about two months ago.