I am sorry for your struggles. There is a lot of pain when we watch our loved ones destroy themselves. I have experienced this with my family, and my own life. It is imperative that he decides that he needs sobriety. There is nothing that you can do to make him want that. By providing for him, he is able to stay in the use and is able to put off getting clean. He may need to go out on his own and figure it out for himself, with out his parents to protect him.That means that you may need to tell your son to leave your home. He needs to take the necessary steps, and you and your husband need to find support for yourselves. He is the only one that can change his outcome. You can change the way that you deal, and feel about it. ALANON is a wonderful fellowship. There are other methods, and I know that others will give suggestions.
I have not tried the 7 weeks to sobriety. I have not heard of this. I am sober though. One day at a time.