My advice, since you asked, would be to find yourself a meeting and learn how the 12-steps can help you regain your balance and live happily...no matter how he is doing.
I wish I could tell you how to save him, lord knows I've tried everything imaginable to save my son. In the end, it is only ourselves we can save, but I promise you that there is hope for better days ahead for you.
Hugs and prayers for you and for him, that he may find a better path soon.
More Hugs