Wow, different side of the story there, isn't it? Your story will be very valuable and bring hope to many on this board, thank you for coming.
First of all, it's apparent that you do not want the M to end. You must be aware of some things about H that you find worthwhile. Why don't you start by listing those? I find lists helpful. Next, set goals, discover what you want out of life and your M, and you'll have a clear, defined path to begin working towards those goals. Let us know if you need help goal setting.
How far away are you from DH? Can you go back home? The phone coaching will help you for sure, at least by giving you hope. Is DH ready for D or does he still want to work through things?
My H also values appearances and I've gained weight. It seems the more he finds me unattractive the more I eat. It's a horrible feeling, so I totally know where you're coming from. It doesn't make him a bad guy, it's just how he's wired. My H never says anything to me about my weight, and I kind of wish he had before it got out of control. I was where I am before he said anything... so you're lucky in that respect that he's honest with you.
Start by listing your goals and letting us know a bit more about where your H's head is right now.
