Move over and let me grab one of those oars.
As something you 'can' do now, have you thought about some form of martial arts? As in real martial arts which incorporates whole of life skills, balance, awareness, courage, judgement etc? Might help to burn off some adrenalin, while also helping focus and perspective. And they wont give you drugs, or talk about your inner child.
Something I am finding helps a lot, with my memory, attention, retaining things and cognitive skills in general (rebuilding the brain) is Luminosity (use google) and its helped more than anything else so far. I can see my good days and my bad, I can see skills for normal life things I have to do...improving. And thats making me more confident to take on other things as I go.
Good luck