Hola, Ray.
Sounds like an interesting dream

Are you the same demon every time, or are you different demons at different times?
Sometimes I think I'm God, but when I try to exercise my awesome powers, they fail

This has only been going on a few weeks. I've written a story about a young Buddhist woman who became a god, but that's not psychosis, that's just a story. Next I'm going to write a story about some Maya Indians who conquer the United States in 2050 A.D.
Yeah, the vision of you loping along on all fours for a week is a bit disquieting. On the other hand, I had a strong imagination when I was a kid, and I occasionally thought I was a hawk, or a cougar, or a bear. Not for a week, though; maybe for an hour. Once my little brother was pretending to be Kimba the white lion, and he ran on all fours and ran into a cement bench and tore his scalp. Bloody mess, that one.
Can't remember any time I thought I was a demon. You seem awfully merciful, to be a real demon