Your son doesn't need to have brain damage of any kind to feel depression or anxiety, first of all. Just going through something traumatic, like a serious injury, can make you view life completely differently and be more afraid than you were before.

Does he have a therapist and a support group? Or friends with anxiety? Drugs from a psychiatrist can help, but it helps a whole lot, too, to have people he can talk to and try to figure out what's going on with?

Also, is he just saying exercise doesn't help him or does he actually do it and say he still feels the same? Because exercising when I'm anxious helps me SO MUCH to be able to cope with my anxiety. It doesn't take all of it away, but it makes it easier.

You're doing good with what you are doing now. The thing with anxiety and depression is that the people around you want to take it away for you, but the only person who can deal with it is the person who has it. Just be supportive and keep saying you'll be there whenever he's upset. That's the best thing you can do.

I agree that pot can trigger anxiety. So can a lot of different things. I can't have alcohol or even caffeine because of my anxiety. If he's willing to try giving those things up, it would be good, but again, he has to decide to do that on his own.