Common Asault incident help please!?

Last night I met my friend and we went round her friends who is a guy that I had met for the first time. He is an alcoholic. He was rude & aggresive to me when he first saw me. He started being nice to me and then switching on me. He then began calling me a fat slag and saying I was ugly. I ignored this as I did not want to aggrivate him as he was very drunk. He threw his dog across the room chucked my coat. He then at 4am picked me up off the ground screamed get the **** out and dragged me byvthe arm & slapped me across the face slightly. He also said he was gonna wrap me up in the rug. I got out te house & called the police! Is this a crime? I am slightly unsure of whether to press charges as I am not sure if he commited an offence. What would happen if I pressed charges?