Most Helpful Guy
You have much bigger problems than the ache in your head.
You are in an abusive relationship. End it. Get out. I would say go to the police, but you appear to have instigated the violence yourself, if your update is accurate.
Most Helpful Girl
March your ass right down to the police station and have him charged with assault. At the very least, leave him. He will hit you again and next time might be a lot worse.