My 9 year old son just got sent home for possible concussion. Hit the back of his head on hard grass at school after being flipped forward, feet over head, playing tag football. He s tired, walking different than normal, pupil in left eye not reacting to light. Right pupil has normal reaction. Physical light touch isn t tolerated on back of his head. Mild headache across forehead. Do I need to take him to Doctor/urgent care? Just watch for any further changes? Thank you, Loni