So I dont take any meds but I experience this infrequent wave of thought although its rare. I don’t have schizophrenia but there are dozens of mental health conditions that can cause psychosis or lesser forms of the condition to appear.
So once I thought my own father robbed banks and he was laundering money because I heard that a man with an Irish accent robbed a corner shop (my dad doesn’t have an Irish accent) and this built up over the weeks)
Once I was walking home and thought that someone set my backpack on fire or planted something in there.
Thought my uncle was a mafia boss and that he was driving to a meeting.
I once avoided contact with the outside word in fear that people were planning against me and waiting to ambush me on the street. I would always cover the windows with blinds and crawl to get to the kitchen
All of these last for a few days up to a month or less before dissipating. Maybe I’m lucky compared to some other people but this is still psychosis.