I don't have much to add as our sitches are pretty different, but if you are still religious I highly recommend picking up a book called Crushed by TD Jakes (it's $15 on Amazon right now). I started it yesterday and it has really helped me to get a new perspective on the entire situation. It's not a book on marriage or divorce, but about how life changing events are used to shape us for something better.
Of course keep on DBing, it sounds like you're doing all the right things. I'd go one step further and leave the house when possible. Buy the book and go read it at a coffee shop or park. Don't tell her where you're going. This has been really relaxing for me the last few days and helping me find another constructive way to GAL.