I am struck by the statement that LW's wife doesn't believe anemia was the source of LW's mental illness. Perhaps it doesn't matter, but I wonder whether LW is an unreliable narrator or something else is going on. Maybe she wanted to leave anyway.

Like some of the preceding commenters, I also noticed how self-centered LW is. I would feel a lot more sympathy had he said something like, "I don't even recognize the person I was and feel so much guilt for the pain I caused."