Can I say how wonderfully understanding your DH is? Look at the difference between this time and the last. He wanted you out of his life. This time he wants you in his life, forever. He can see why this has happened, he can actually appreciate what you are going through, he finally gets it and bloody hats off to him for sure!
You need to listen, yes siree Mrs. Get thee pottering just like before. Yes, work got busy, real busy and he needed you to be there much more but now he can see that the cost to you, to your health, to both of you is not worth it. Not one bit.
If he can manage without you there, then do something else. For you. Find a hobby, meet up with friends, hell, why not drive the Bus for a bit and come see some of us Babes? A UK and beyond tour?
You'd be welcome at Chez Mouse any time and would even have your very own log cabin, yes, really! 
This has all happened so fast in the grand scheme of things but it has to stop NOW. Well done lovely lady for posting, for being totally honest with yourself, for getting up from the floor and taking action TODAY.
I know you miss DD
. Have you thought about a pet? Seriously? Why not? I love having Seth here when DH is not. Especially when DD AND DH aren't here! I am not good at alone and knowing he's here when I'm without adult company, really makes me feel needed. You need to feel needed again. xx
Oh lovely lady, you have so much more to give, you are this thread. You are THE BRAVEST BABE OF ALL!
Oh, and BTW, today I am not drinking either and that's down to YOU xx