momwhocares, did the concussion trigger other mental health issues in your son, or are you still working from the assumption that the concussion is the one central issue?

I have a 19 year old with ADHD and Autism, and he headbangs to that awful music. I worry so much every time I see that behavior; I can't even watch someone hit their head on TV without feeling it in my own, lol.

You are 'lucky' in one respect; your son's issues were not work related; that adds at least 2 years to the wait for actual treatment.