Sheryl, it might be possible--if he got a prescription for a benzo type drug from a doctor--and is "whiteknuckling" it. Typically, this won't last for a very long time--esp. if he is in such deep denial and is not attending a program.
I say--give it enough time--and more of the Story will be revealed". This sounds like typical behavior--to project blame on an outside source. Anyone who has tried to get between the alcoholic and their liquor is viewed as the enemy.
This should not change your strategies for yourself. I say, proceed ahead with your own program and attend to your best welfare.
dandylion