My fiancé attacked me

It’s 2:30 AM. You all are the only people I have right now. My fiancé and I got back in from drinking about an hour ago. We’re laying in bed and I thought he was asleep and all of a sudden he rolls over on top of me and bites one of my hands until it bleeds and covers my mouth and nose with the other hand telling me to shut up accusing him of stuff. I hadn’t said a word since we got in bed. I’m in the bathroom now cause I told him I had to pee and he responded with “if you don’t come back I will hunt you down.” Nothing like this has ever happened. I’m scared and idk what to do.