My son had a helmet to helmet hit in football practice tuesday night and he had a headache that night and the next day, felt better this morning. He was checked by his coach s and he was ok to keep practicing, We kept a close eye on him for several hour s before he went to sleep, always asking if he felt different in any way, he did not. He knew to tell me because he knew I was going to take him into our local ER and get him checked out. He has not had a practice since then but I am now regretting not taking him. If I take him now would they be able to tell me anything , and when we go what test should I make sure they are doing to confirm that he is ok..