I am sorry you are at this hard place and that your D is having to suffer in this way too.
Your W sounds as though she has major problems and I would question whether or not she has had the right type of C for the last few years. She needs to seek help and cure herself before she can work on your M. She sounds seriously depressed.
All you can do is look after yourself and your D and try to protect your D from the worst of the fall out.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength