But, having been involved in some pretty rough activities over the years (military
and civilian), it sounds like you had, at the least, a concussion
. (Been there.)
Get thee to sick call, before the trouble becomes permanent.
Your story is one I have lived: banged your head, felt okay after a little bit, shrugged it off...but now you think different.
Hell, 6 years ago I fell out of a tree while climbing to my stand during deer season - 15' down, flat on my back.