yez plz look to the al anon directory...there are often many meetings with childcare (for obvious and beautiful reasons!)
also, maybe check into some women's crisis programs as they probably offer very affordable or free child counseling sessions. childhood issues and grief are complicated but totally navigable and the insight from a third party may be a huge gift to your family. thinking that you can take care of all this on your own is really just expecting too much of yourself! as much as you are capable of investigating an addicts moves (that is if you're worth your weight as a codependent!) you can investigate resources for assistance.
drug addiction has been on the frontlines of research on a national level and there have been a lot of programs to help deal with the fall out. this is not a personal thing for any of us...we are, for lack of a better term, caught in an epidemic and it has contagious fall out. get some help for your kids, yes? you don't need to do this alone...it takes a village to raise a child and a loving supportive village for a child who has lived around addiction.
life will be good. life is good.
it sounds like you keep doing the next right thing.
kudos! proud of you YEZ. keep doing it. you are loved