I'm another one who can relate, though the specifics are different.
I put my XWH through medical school and was supposed to be able to no longer work a demanding job, until he cheated.
It's hard to give up the dream of what you thought your life would be (and what it had been to date) and what it's going to be.
Like 7years, I worked out a lot -- running, yoga, weights. I also took up painting (creative outlets help, too!)
I focused on me and not on what could have been -- sure I don't have as much money as I would have had I stayed married, but I am much happier than I was. I read a ton of books on happiness and internalized that it's so much more than money.
I think one of the hardest things for me with this is that it completely shattered my worldview. I used to believe that if you were a good person and did things "right" (good grades, college, treated people well) then good things would happen to you. And while I still do believe that to a certain extent, it's more apparent to me than ever that luck plays a huge role in life, and it's up to us to make the best of whatever situation we find ourselves in.
I try to focus on the positives in my life, and realize how good things really are. Reading the paper can help with this, and there were many days in the beginning when I would remind myself, "at least a guy who thought he was a zombie didn't try to eat your face today. At least you weren't the victim of a deadly home invasion," etc. I don't think that comparison is healthy, and once I got healthier, I no longer needed to do this, but it certainly helped when I was feeling sorry for myself in the beginning.
(((gardens))) You'll get through this!
Me: BW, divorced, now fabulous and happy!
Married: 11 years, no kids
Character is destiny