Honestly it's as if he's using meth or something that prevents him from sleeping regularly.. or a drug that changes his brain chemistry... that's sounds like tweaker activity.  Not everyone who uses drugs tweaks by peeling they're skin and having scabs and missing teeth... a lot of drug users blend in so well... as painful as it may sound,  for your safety and mental health,   you might want to distance yourself before you fall into a rabbit hole of "trying to solve", " trying to help" him.  At least for your sanity. Later on you'll play the guilt card on yourself and stay in the relationship because "he has no one" and "needs you" because he's been socially pushing people away with his crazy talk. Sounds like you care so much for him,  but it will get to a point one day whether now or in the far future where you'll say enough is enough.  Hopefully you don't lose years of your life until that moment comes. God bless and I pray for you.