Liz, did you decide to stick around with your A? I know you were planning on leaving for awhile.
Zen Florence says that as an addict, your AH is going to abuse every drug at his disposal, including the prescription drugs. Accepting this is the end of your fear. Addiction is by definition compulsive and catastrophic. This is the line he's riding, and if you choose to stay with him, you as well.
I don't have any advice here. I left my STBXAH in part because I couldn't handle living like this and it was encroaching on all other areas of my life.
Sending all my peace and love.