Please someone tell me what the hell I should do.

My husband abuses me. I'm 6 weeks pregnant and we already have another child together. Tonight he hit me because I wanted help changing our daughters diaper and he didn't want to because is was poopy. I said well when we have two kids and they both have poopy Butt's am I gonna have to change both? He than punched me in my shoulder. I got up and went to the bathroom and he said yeah go cry, you know what you did wrong. He treats me like I'm an animal. I have called the cops on him before but clearly that is just not working..

I have no friends or family where we live so it is not like I can just pack my things and leave because I have no where to go. I don't know what to do. I'm still locked in the bathroom crying because I'm scared to leave because I don't know what he will do to me. I always say or do the wrong things and he punishes me for them like I'm a bad dog..