I don't consider you a WAW. You are a human being who has dealt w/a lot of stuff over the years and your h is lost in the land of MLC/depression and can't seem to find his way out. You've done all you can do for him, the marriage and now you have to look out for you.
If you allow his depression to bring you down into the dark pit w/him, you'll never get out. You are doing what is right for you and you only. Many of us have been right where you are now...
Please take care of yourself.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.