OMG, I'm so sorry top hear about these things!! (((HUGS)))

I agree with those who said he probably bit you because he wanted to walk around and you (your arm) didn't let him. Please don't give up on him. I wish I'd have a better advice for you, but I don't have much experiences with agressive cats (only with "Dino the Meano", my mom's fiancé's cat who has also bitten me btw).

I'm worried about your wrist though... Maybe he hit a nerve or a ligament. I can understand why you don't want to go to the hospital, but can't you tell them you've been bitten by a feral? Maybe that way they won't check your house?

However, I'm wishing you with all my heart that this was a nonrecurring incident.

Kirsten