Will he ever forgive me? Will he understand?

Yesterday was a bad night. I am bipolar and pregnant, and my emotions always get the better of me, even though I take meds. My husband is 18 and I am 22...and I was just so cruel to him yesterday. I went into his room and noticed that he left his clothes on the ground (a big pet peeve for me) and I just lost it. I went over to him and slapped him and told him that I hated him. He was surprised and confused, and I just picked up my purse and left for a friend's house to cool off. He tried to calm me down, but I told him eff you and I left. I'm back home now and he's at work...but man, I feel horrible. I didn't mean to freak out like that. Will he forgive me? I feel awful always taking my anger out on this boy, but I can't control myself.