Pouncer, I know exactly how you feel. My spouse promised no alcohol in the house after I finished rehab. I was so RELIEVED! But that didn't last long and after about 8 months of sobriety, I relapsed on vacation after finding the vodka stash.
The sneaky, secretive drinking began for me. It's happened several times in the last 6 years, usually on vacations or during the holidays.
I don't know if my Spouse is a very high-functioning alcoholic or a "normal" drinker who has 3 or 4 stiff drinks every night, but I really have to try to focus on ME. AA meetings help tremendously although several old-timers have suggested I go to Al-Anon meetings too.
Talk to him and see if he will consider making the house dry, at least for a few months. I don't know about your marriage, but it's caused a huge, not spoken about division in ours. I can't be around drunk people (they are so boring) for very long, so we end up doing different things at night.
I'm sorry! It's a mess, isn't it?
Are you going to tell him you've been sneaking drinks?