My 8 year old ds had a very hard game of football today, and was very active all afternoon. He's just woken up crying with pain in his shin. He says it really aches all the way down his shin bone from the knee to ankle. No bruise and he says he didn't get kicked or anything. I've given him some calpol and a wheat bag and he's gone to sleep again. Any ideas? He's very stoical about minor injuries as a rule, so I know it must really hurt. Any ideas