I fell and hitmy head nov 13th 2010 and it knocked me out. when i came to i was in hospital going thru cat scan no problems .. for 3 months i had a HUGE bump on the back partial left side of head. It is still sore and now i have headaches and sometimes my vision does weird things.. if i toch the back of my head it is still tender is this normal .. er said i had damage to the skull but thts it i hit a concrete floor and immediatly after hitting it i was knocked out cold for aboout 20 min and went in and out of conciosness.. please i need answes. why does my head still hurt after 3 months