As so often happens when I read someone's first post, the post where it all just tumbles out, I see my story as well. I was reading your post, nodding my head at most of what you said: "bait and switch" "twice a year" "not the best communicator" "at her initiative", "it's always my fault that I feel bad" and my favorite, "even seeing a passionate kiss on tv" would get you upset because you didn't feel loved.

The only differences between you and I are that you have no kids (I have one with W); your W has medical problems that are related to sex; and you moved out.

I guess the first question that sprang to my mind is what has she done to address her medical issues? Were they always an issue, even early on? (Because if they were, you kind of ignored that red flag, didn't you? Not trying to be a jerk here, I certainly ignored my share of red flags, too.)
I'm sure the others will chime in with questions and suggestions of their own, but I just wanted to let you know that one of the best things about this group is that you realize that you are not alone, that others are out there who share your pain, and, as most will agree, someone on here has it EVEN WORSE than you! :^)