At 3 weeks and three days I am sure he feels as though it is an eternity. I do not know if this is valid but the neuro-psych had this to say about me. That recovery can be up to 2 years, I guess I really got conked on the head. That said, your son still sounds as though he may still in recovery. I would caution slow and steady. When symptoms present then ease up a little so as to not suffer a serious set back. There are sure to be ups and downs but if improvement is consistent over the long run...