I got punched in the head 3 days ago and wondering about possible concussion.?

I accidentally bumped into a girl on the dancefloor and her boyfriend turned around and cracked me a full force punch into the forehead. I was a bit drunk at the time but it still really hurt and I was dizzy and disoriented. The following day the area was very sore to the touch and a heahache persisted as well. 3 days on the headaches have eased a little but i still dont feel myself and been reclusive with my mates and stuff. Im worried about brain damage and internal bleeding which i know is not helping with the headaches, but I feel like i would be wasting the doctors time if i went. I guess I think it's easier not to know of there's something wrong, but as I said the condition improved over the past day and maybe I just got a concussion that I beginning to get over. Plainly was just looking for any advice on how to get over feeling somehow less of the person i was before?