I am very pleased your son is on his way to recovery. My 14 yo son had a concussion from receiving a late hit in a football game last fall. He seemed fine after the game then the headaches came later that day and stuck around for a few days after. I can handle injuries to the bones, joints and muscles but this is one area that I am constantly concerned about given how broad the symptoms are and so little is known about this injury and long term affects.