Don't leave the house
You need to keep what stability you can for your son. Your husband's problems should not become his. Your son should not become a part of the swirl. Not even for a week. Even if right now you think you are hiding it from him. Your leaving to give your husband space is sending the wrong message everywhere...
to your husband, to your son, and to yourself.
If you want emotional support, will your mother come to you? It doesn't matter how that makes him feel, it is time to do what is good for you.
If we here can tell you one thing, it is that nothing you do will effect his success or failure in recovery. Nothing. None of it is effected by what you do or don't do. If he tries to tell you differently, it would be just manipulation to get what he wants.
As he works through his problems let him see a strong, loving woman and great mother who had the strength to stand by him during his worst times, and now is standing by herself and her son with that same strength as some bad times seem to be coming their way because of his selfishness.