Daybreak, Dealing with a spouse's depression is tough. My W has come out of hers to some extent, but I think it's going to take a change in jobs, and quitting smoking before she bumps up another level.
Is there no opportunity for platonic connection? Is the M as barren as you describe? If it is, all you can do is GAL, and wait for the situation to improve.
Do you sleep in separate beds? I would sleep in the guest room, when my W was sleeping elsewhere on a regular basis. It helped me to keep an emotional distance from the situation, while I got my feet on the ground.
CL
CL 53 W 54 M 20 yrs. 03'-09' Separation + Old Patterns + GAL 10-14' Piecing
"The Master allows things to happen. She shapes events as they come."