>I am now sure that I have some kind of psychosis.

The fact that you reognize it is probably a good thing; most people experiencing psychosis don't suspect they are psychotic. I know you've had a bad experience with medications, but it's your right to decide to take them or not. No matter if you do see a doctor, they can't force you at your age to take medications- unless you or anyone else is in imminent danger due to the psychosis. [Of course, I live in Canada, so I know barely anything about the mental health system elsewhere].

Psychosis can be secondary to a mood disorder, or caused by it, and if your depression is a larger problem or you suspect that the psychosis has resulted from it, this could be the case.