Cashart, I am going through something quite similar right now. I just came out of a long mania/'psychosis thing and now, yesterday, I had all this dysphoric psychosis/darkness/evil/doom. Awful. I totally relate.

I have had this before and I know it is just something I get occasionally. It will fade away, as will yours. It is as fern describes, in my opinion, a combination of coming down plus some powerful meds hitting you. It is a big neural change. But it will pass. Don't give up.

Sleep if you need to sleep. That's what we are supposed to do when it is like this. It will pass.