Welcome to Neuro Talk. This is a good place to find out information. There are alot of people here who have TBI who will be able to help you out a bit more than I can. I do however react as a mother myself. I would have my child checked out, as he is displaying behavior that is not normal for him. Certainly I wouldn't have him in a tournament without medical all clear, as these kinds of injuries can be re-injured and make the symptoms worse.
I suppose I was the kind of mother that even if I were wrong, I would feel better after the appt. Your son could then go to his event without worry and so could you. I do wish you all the best. I hope some others will post to you with more ideas and suggestions. another mother, ginnie