Marriage falling apart?

Me and my husband have been together since April 28th of 2012 we have been through a lot together his mom has not liked me since day one and has caused a lot of drama and has tried to split us up she still does this me and him have 2 small babies together and his mom has told us she refuses to except our kids or she doesn't have too she has called me bitch and threatened to beat my ass and all kinds of things he will get mad at his parents and often take his anger out on me he works nights so when he comes home he will sleep on the couch instead of getting in bed with me we have been fighting a lot more lately about everything and the drama is getting bad he often gets mad and takes it out on me if I wake him up even if he has had hours of sleep I often feel like he intimidates me I am not sure you but he is a big muscler guy and very broad and is tall as for me I am short and not very big I feel like sometimes unhappy but love him so much it huts to think about leaving and sometimes don't want sex with him lately plz help