Am I in trouble?

Last night I was out on the pub and this dude who got irritated over god knows what and decided to take it out on me. So basicly I ended up on the floor getting my head stomped on.

Now I’m feeling really nacious, figure I have a small concusion or something. Could this be something bad? I mean should I go to the hospital? I really dont feel like sitting around in some waiting room for 5 hours just to have a doctor say you have a concusion.