Welcome to the forum. Schizophrenia must be a tough condition to deal with. I don't have it, I have bipolar and aspergers, but some of my bipolar symptoms overlap. I get catatonia (or used to before I got medicated for it, these days it rarely happens but it used to happen several times a day), where my body becomes stiff and I physically cannot move anything even though I'm screaming in my head "MOVE MOVE". Sometimes I experience derealization and similar mental states where the external world suddenly doesn't seem real, and I can find this very scary - often I sink to the ground and curl up in a ball because I've lost all sense of connectedness or gravity. Sometimes when I have sudden intense depression it's like all the colours become warped and more grey than they should be, or like I'm falling into blackness inside my head. They happen fast and severe, like hallucinations, because my bipolar is very rapid cycling.
When I'm depressed I can become paranoid and I hear my own voice in a constant stream inside my head telling me negative things like my boyfriend is cheating on me/using me for sex/I've convinced myself I'm in love with him but I'm really not, my friends are using me/aren't really my friends/dislike or don't give a stuff about me, etc. I don't ever tell anybody that I think these things because I know it could really hurt them.
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Into the dark...