Welcome! Great advice ahead of me.
Concentrate on you and your son, let abf concentrate on his recovery, as if he does not recover and stay on the right track, he will not be a good dad to your son. He cannot be as drugs will be his priorty, not you, not your son. Sounds so simplistic, yet it is the truth.
Take this time to work on you, read Codependent No More, get to some meetings, keep poisting, keep reading this forum. There are alot of great threads on the F&F of alcoholics and addicts, take a few minutes to read through them.