Hi there - I was on your previous thread.
Very often when someone has lived for a long time in 'reaction' mode it feels odd and uncomfortable to switch to 'action'.
Reaction mode involves a lot of watching, anticipating, mopping up, smoothing over cracks, damage control, and essentially centering someone else's problem. You do it because you're kind and conscientious, and you get sucked into a dynamic that is very predictable with addiction.
It's not easy at all to change that habit of mind, to center yourself instead of that other person's problem. You find yourself outside of the 'comfort zone' you have been accustomed to. Only as time passes will you see how uncomfortable that zone really was.
Don't misinterpret your discomfort now as a sign that you are doing the wrong thing. Positive decision making and positive action will feel strange when you break out of the orbit of the problem that has dominated your life for the past several years. And don't underestimate the pull of the familiar, the reality of nerves in a new beginning.
In time, if your H stays off the booze and drugs the two of you can be friends. He will be a new person if he can manage that. But for now, keep on reminding yourself that you and the children need and deserve a life that is not spent waiting anxiously for disaster to strike.
Wishing you strength and courage.