I fell off yesterday over a largish jump (out hunting), and had to go home as I couldn't remember easily what day it was, had double vision and couldn't get my right hand to obey me at all - it was the wierdest thing I've ever experienced. The eyes and hand are fine now, but I still have a stonking headache which not even Paracetamol/Codeine will touch.
I'm spending the rest of the day whimpering in front of the fire and think that if it still hurts tomorrow a trip to the gp will be in order. I've fallen off a fair amount but that's the first time I've banged my head - not an experience I want to repeat in a hurry!