Hi, and welcome.
redatlanta could not have put it any better. I am an alcoholic (six years sober) and yeah, it pretty much feels like a full-time job being an actively drinking alcoholic. I've also been in two marriages to alcoholics, and I understand very well the stress you are under. I was fortunate enough not to have young children in my home during those times, but it complicates things tremendously. And it's miserable even if it's just you that you're responsible for.
You don't have to make any decisions (permanent, long-term ones) right now, but red is right about needing to shift priorities. I really strongly suggest you check out Al-Anon, which is a support group for families of alcoholics. It was a lifeline for me when I was at my most desperate. You can learn there how to get your head clear so you can make good decisions that are in the best interest of you and your kiddos.