Welcome Kim! I am new here myself. I have looked back at things from my teen years that were probably small MS attacks that were written off as something else. I am not sure how I would have taken the diagnosis at your son's age. I have 2 sons of my own now, 10y and 5.5ys, I can not imagine how I would feel if it was them. So mom to mom I am sending you a HUG and a

It can not be easy having a child (even if he does think he is all grown up now

) with MS and having to make or help them make such major decisions as treatments, symptom management, etc on top of the normal everyday teen issues.
Good luck to both of you!