three months ago i had brain surgery and made a very great and quick recovery with no brain damage as far as i could tell...i felt fine and i felt like myself. but one week ago i went to a party and i got punched in the back of the head about ten times by a kid who was trying to prove his manhood in front of a couple girls.. his punches were really hard and he said i'm surprised you're still conscious. i saw stars and flashes and all that and got deja vu while it was happening. ever since i haven't felt the same. I feel tired and depressed and i just don't feel like me. has anyone else had something like this happen? should i be worried about brain damage or serious injury like bleeding in the brain?