I always picture it like this: your husband is in a deep hole and can't get himself out but if you jump in there with him, your both stuck with no way to help each other out. Alanon, therapy ect is like gaining tools to help you both.
What you have been doing so far isn't working, it can help to give alanon a try and possible learn about some new tools you can use for yourself which could then possible help him.
If nothing changes nothing changes.