I think my fiancee has this disorder, I'm not sure

Briefly put, my fiancee snapped and went psycho the other night. He physically controlled me and threatened to kill me and other people in the apartment and himself. He was completely delusional and I'm lucky I wasn't badly hurt because he pulled out a knife at one point. He would talk in a complete growl, like he was demon possessed. It faded very slowly and about an hour later he was almost back to normal and fell asleep. I would've called the cops but I was scared he would hurt me if he saw me leave.

I fell asleep and when we woke up he was completely normal and horrified at what had happened. I don't know what to do for him. I have seen short glimpses of this psychotic mood before but never to this degree. It seems like it was exacerbated by a combination of stress, self-loathing, and alcohol.

OMG U NEED 2 LEAVE HIM OMG HES A NUTTER! SERIOUSLY I DONT WANNA B RUDE YEA BUH DIS MAN... ITS JUS NOT NORMAL 4 HIM 2 DO DAT!!! IF U REEELI LYKE DIS GUY N DONT WANNA LEAVE HIM DEN I FINK IT WUB GOOD IF HE GETS SUM HELP 2 TALK ABOUT SUM OF HIS ISSUES SERIOUSLY DO SUMING BE4 IT GETS OUT OF HAND...

Wendy,
This is not something you should take lightly or just brush off. I would have terrified and called the police. I feel that your b/f needs professional help. What would it be like if you were married to him or had kids with him? It could all result in a tragedy that I don't even want to imagine.

Why not take a break from seeing him till he is ready to get some help. If he protested then I would just force myself to leave him for my own good.

Sweetngentle

Just ask yourself this important question. Does this behavior make you happy? Remember, the only person you can change is yourself. The only thing you can change is your reaction to your fiancee. If he doesn't realize he needs help, if he dosen't want help, then there is nothing you can do. That is when you have to decide whether you will stay, or leave.