psychosis (having delusional thoughts, delusional beliefs that turn out to have no real basis to them, hallucinations) can be short term or long term, they can come and go with and with out treatment. sometimes it happens to me when I havent gotten enough sleep, but then when my body has gotten enough sleep the hallucinations and delusions stop, sometimes when I am not eating correctly I will have the same psychosis reactions but once I change my eating habits the delusions\hallucinations go away. sometimes I have hallucinations and delusions when I am under stress. if I take time to take care of myself and de stress my life a bit the delusions and hallucinations goes away.

my point is there are many different things that can cause a person to have short term or long term psychotic reactions like hallucinating and having delusional thoughts, delusional beliefs...

if not knowing where your psychosis type symptoms came from and why they suddenly went way continues to bother you contact your treatment providers (doctors, therapists, psychiatrists...) they will help you to figure out what was causing it and what made it go away.