They're not all like that. I've had mostly good experiences in them and I've been there quite frequently. As for shadow people I don't think you should be worried as you see them mostly in a semi sleep state.

My psychosis didn't go on for long thank god. I got hospitalized before it could continue. It started with me thinking my husband was controlling me with my medication. Eventually it devolved into thinking people could hear my thoughts, thinking someone was trying to get me to kill myself by telling me to in my head. Then I thought since that person wanted me dead and I didn't know who it was then everyone was suspect. It was pretty terrible. I locked myself In the bathroom at partial care because I was sure those people could read my thoughts and wanted me dead.

Since then I've had moments of weirdness...once in group I thought I wasn't real anymore and that half the group members weren't real and had been replaced by robots. But I thought that was irrational so I pushed it away. I had the tv talk to me. But again I knew that was impossible so I pushed it away. Since I've been on invega I haven't had any breakthrough symptoms.