I am no therapist, but I have an idea.
First, take it one day at a time. Next, once you and your husband decide on an clear, defined goals, then put together a plan to accomplish those goals. Doing this can only enhance communication ands make the other aware of how they can help the situation. And also this can communicate what each person can realistically do. Then follow through with the plan a day at a time. There will be upsets from either of you. However, just making the commitment can help allot.
I would seek professional help if the two of you cannot do this on your own. This can turn out to be a major hurdle for both of you. There may be free help in the community in the form of the counseling for addicts. There are allot of them out there you know. Just being able to work on your problems together in any way I think would be a big accomplishment.
Its like a person once told me: breathe in, breathe out, out with the bad air and in with the good air.
I hope this helps! We are here for you!