Wow, sweetie, I am sorry to hear you are going through this tough time.
You have worked hard and you have beat addiction but I fear for you being exposed to addicting substances and also the anxiety it is causing you.
Try to remember these things:
You did not cause your loved one to abuse substances.
You cannot cure his addiction.
You will never be able to control his behavior.
Have you a therapist for yourself to talk over this situation ? I know this is sad for you but in the end I hope all works out well. ((((((Hugs)))))