Ive said this to evry reply so far lol, but meditation and especially yogic breathing could be a great aid in helping your brother in his recovery.
Yoga wouldnt have survived thus far if it wasnt a great tool for bringing calm, balance and peace to those who practice it.
Yogic breathing regulates the bodies energy flow, so when breathing is done correctly a smooth, pure flow of energy is radiated out along with any extra bagage such as stress.
I would also reccomend alot of walkking and general outdoors activity. Green is the universal colour of healing,and mother nature is always willing to help heal us.
Talk to him, ask him questions, but direct him in a direction of harmony, whatever it may be.
Hope this helps,
(=^_^=)