It is some consolation for you that you have an incentive I dare say, but it must be really tough for you if you're doing it more so for your husband than yourself and the temptation must be really difficult.
Maybe it will help a little if you return the focus to yourself? And not drink/not do drugs for you? If you think about the difference between when your clean and not clean and the person you want to be a little more (although sure you're trying this?!).
Is there a support group near you you could drop in on- if you have a usual one but they aren't running a meeting for a little while I'm sure another one with a group being held sooner would be happy to have you drop in. Must be really hard for you a the minute.