Just my humble opinion... but it sounds as though both of you are hurting your marriage. You both struggle with addiction problems, and while you are working to overcome yours, your hub is not.

I see similarities to the issues I had in my first marriage. I gave up the drinking, my hub didn't give up the pot. I finally left when one of my sons ended up in trouble because he was using drugs. Turned out he had been using from the age of 9 when he found his dad's stash.

So... my advice would be to find counseling for yourself - perhaps a combo of AA and Al-Anon to start. AA for yourself and Al-Anon to learn how to react/respond to your hub's addiction. (Al-Anon is not just for people who are dealing with alcoholics).

Your own self-worth and self-esteem as well as your children's matter. And, I would suspect your lack of interest in sex might stem from the anger you have against your hub because he is using. I know mine did during those years of my life.

I wish you the very best. Please take steps to take care of yourself and your children.