I am glad your husband is doing ok. I just want to mention one thing. You said u and he had a very open and honest relationship. I think you may want to look at that again. If he was lying to you about the drugs then it wasn't open and honest. He may continue to lie about drugs and other behaviors which he feels you wouldn't approve of. Just a thought.
Take care of you. If you are not ok you are no good for anyone including yourself.