I've fractured my skull before after drinking waay too much and falling over landing on the side of the kerb with my head. I could physically move a portion of bone on my forehead so I immediately knew something was wrong, what worried me was that the doctor didn't really care! He told me the front part of your skull is one of the hardest bones to break and if a concrete kerb did that to me I must have hit it with some force. Now I dont know about punch's to the head but I doubt that that punch has caused a big head injury, but please get it checked out anyway.

You never know and having a doctor take a close look at you is always advisiable. I had a headache for 3 months after my accident and its the same kind of pain your describing, I think you may have bruised your head a bit