Ah, a concussion's a concussion, nothing to see the over nosy men in white coats about. You can wait it out.
You lie on your back for what seems like a year, fortunately you have your watch to keep you right, its been 10 minutes, who could have known doing nothing was so boring. "I'm hungry," nags your stomach in an over whiney tone that you can't really be bothered with at the moment, you punch it, momentarily forgetting it was a part of you, ouch, not your best idea but hey ho. You look around for a mirror for the soul fact you want to give yourself the evils for hitting you. This is when you start to thing maybe you are slightly out of it.
You stare fixated at the roof of the cave, brown, good colour that one eh, same colour as shit which would probably be an accurate reflection on how you are feeling right now; trapped in a cave that you are becoming overly aware is next to a river with a head ache, best day ever. Well you think its a river anyway, you really can't be bothered getting up to check but for all the racket its making it could be a waterfall. What do you know about waterfalls?
Its water, and it falls. Water is wet, you giggle for a bit at your blind attempt at remembering. But water falls, why does it have to fall, what if it dies, can water die? You don't know, you explore the though a minute before coming to the conclusion no one cares. But why does no one care, poor water, if you were a water molecule you would totally kill yourself, which brings you back round to the question can water die?
After about three hours of chasing yourself round in circles you give in and accept you probably have slightly worse than a mild concussion, well that would explain the sticky red stuff messing up your hair anyway. You knew that was something important but couldn't remember what, something beginning with a "b," or maybe a "d," you always got the two mixed up.
Anyway, moving on, you had to think of a way to get help if you weren't willing to go to hospital, what do you do?