Navy, your W is hiding it. My mom, I think by best guess, has been hiding it for 30+ years. That's about when her and my dad stopped going out socially (I think about the time he had his affair).
I will not advise you what to do. There IS nothing you can do. I mean I will not tell you to get out and get on with your life for your sake and your kids. That is a choice you will have to make... every day...
Just as she will make the choice, every day, whether she will or will not drink... or whether she will or will not admit she has a problem, seek help, and continue to choose not to drink.