In your dream, your daughter sees you and you are unable to stop her from getting hurt. It is an awful dream but does say a lot about your guilt and anxiety as you confront your marriage situation. The fact that you are in such pain really does show your commitment to her.
It's hard to read about your torment because I have been there and because you are someone whose warmth comes through, even on a computer. Your sense of humor is a gift.
Corri is right... you are moving towards health, although it does not feel that way. Your mind and body will not tolerate the status quo and this is a sign of your humanness.