You are so right; you see a glimpse of the person you fell in love with and then, you can almost see her disappear right in front of your eyes.
I'm with you on the sitch doing SOMETHING. Limbo sucks. Hang in there and be a good dad. We will either have the patience and the testicular fortitude to do what we need to do to help our M not only survive, but grow, or we will know when enough is enough and we deserve so much more. Right now, I want my M back for me and our kids. How long can only one person try? I don't know.
Anyway, expect the roller coaster and try to just go along with it. Don't get too high or too low. I know, easy not to get too high!
Stay strong, you're doing fine. (I know it doesn't feel that way-nothing is fine anymore. It's relative!!!)