I love him, but he went crazy. I need help.?

My boyfriend and I were together for about four months. We were in complete love. We were great together. We shared so many similarites and got along amost perfectly. When we did fight, we were usually drunk. Every so often during our fights he has grabbed me, not letting me walk away if I was mad. But, one morning, being the grumpy person I am, I kinda gave him attitude as soon as we woke up. No drugs, no drinking were involved. He proceeded to grab my head and slam it a few times, pretty hard, into the wall behind me. I was so freaked out and hurt. This went on for about a half hour. I tried to run because I could see in his eyes, it was not him. He kept on hitting, throwing and choking me if I tried to retaliate. So, I sat in a corner and just cried while he repeated "good, you belittle me, now you know how bad it hurts." I have a restraining order now. But I miss the man I fell in love with. He has told me he wants help because he loves me. How do I get over this situation?