I'm glad you posted! I just posted on here again, too, just to check in. Like you, I have been reading everyday, but I want to make sure I keep myself accountable on here, too.
It sounds like you are taking all the right precautions, looking ahead to the upcoming trip, and recognizing when you are most likely to have urges to cave. I'm sorry your husband has been so depressed. As someone with depression myself, I can say just because he isn't doing anything, doesn't mean he doesn't want to, or that he is purposely sabotaging himself. I can't speak for him, but I know that for me it is very hard to even want to do anything to help myself, let alone actually do it. Hearing advice from an outside source doesn't always compute into the depressed brain. At least you have been doing so well on your journey, so you know you have the experiences to help him when he's ready, whatever the problems may be.