Take care of yourself AND the children.
And I think a lot of time, the "take care of yourself" has a silent "stop putting the A at the center of your attention" in it.
That was my problem. I pretty much wiped myself out and let everything in our life circle around the A. My kids still talk about how they would panic when they heard his car in the driveway and run around like crazy picking up their toys and stuff so that he wouldn't have a reason to get mad when he walked in the door. For me, changing that was what "focus on yourself" meant -- not trying to make his world smooth at every turn, not walking on eggshells around him, just living my life.
I think it's wise of you to realize that drinking again is very likely. Detox just gets the alcohol out of the system -- it's like a tow truck that pulls you out of the ditch. It doesn't do anything to fix the problem that landed you in the ditch in the first place. Is he going to AA, working a program, doing anything in an attempt to not just get detoxed but actually stay sober?