Let me first say my situation is very different because there are no children involved.
My AH is a coke addict. for a while, he didn't think he had a problem either, but he FINALLY realized he did and got help, so there is hope. I moved out before he realized he had a problem. He attempted suicide before he realized he had a problem... Until your AH realizes he has a problem, nothing will change. And, even then there are no guarantees that treatment will work. I don't mean to sound negative, it is just the nature of the disease.
I know it is hard to even think about leaving beacuase I am sure you love your husband, but he is not putting you first right now.
I would just research your options and really think about the best way to protect your children and yourself.
Hugs and prayers,
Tiffany