Well, first off I'm so sorry this has happened to your family.
Second, addiction is a disease and your husband needs some serious help. It isn't that he doesn't love you enough to "just quit," it is that his body has become addicted to these medicines. You say you were an addict yourself. Congratulations on your recovery from it! That is a huge accomplishment in your life. But your husband is going to need some serious help and you can't do this by yourself. Just like any disease he will have the possibility of relapse and so on.
Obviously he is going to need to take that first step and admit that he is an addict. Until he can do that there isn't much you can do but keep at him, especially since he is the bread winner of your family. You may need to do an intervention. Because your family is having trouble financially because of this, so I would suggest trying local churches for help. I know there is a church in my neighborhood that does interventions and has addiction counceling, so I'm sure there are such things in other cities as well.
This is not healthy for you or your children. If necessary, you may also be able to find out how to get help to get away from him, esepcially since you say he doesn't hide this from your kids. Your kids are your priority now. Please, please be strong for them because they have already lost their father, so to speak, to addiction, so now they really need you. There is help for women and their children out there. I'm so sorry this is happening for you family.
Please take care and keep us updated. I hope that you can get through this hard time.
I forgot to mention that my husband is also prescrbed xanax 1mg for his nerves, but he sells or trades them so he can obtain the pain pills. He says the pain pills give him energy and make him feel better. He doesnt bother to hide his addiction from our children and our 5 yr. old is all the time calling him "drug addict." I used to be hooked on crystal meth so i kno it can be hard to quit, but everytime i try to help him quit when he asks me to it doesnt work. now, he just doesnt see any wrong in it. It is really hurting our kids and that is my main worry is the kids. i could care less about him anymore. But we are soooo poor that we would be homeless without him working.
Any ideas on solving this kind of problem?