we interupt the speculation for some education.. as I occasionally do, I try to impart a bit of knowledge.
While pure speculation, after observing him on TV, one notices while not being obese, he is a decent size guy and rather intense, which could lend to hypertension (high blood pressure) and high cholesteral... and possible cardiac conditons...of the medications commonly prescribe some are of the blood thinner/anticoagulation variety, which could result in a little bleed never stopping. also anothe thing that a lot don't realize i that common aspirin has the same effect. NEVER take aspirin after a head injury no matter how slight or possible internal injuries.
these are just what ifs, but could be unrecognized contributing factors
Big clue..if you get hit in the head, and arent feeling good afterwards GO TO THE DOCTORS! any disorientation and or neasuea is the sign of a concussion at the very minimum. you need a ct scan. A very small bleed can cause big problems..is a sealed unit up there..there is no where for any bleed to go except to start compressing brain matter.