Read NMMNG. I was absolutely floored by it. I read Dieda also and it did have an impact also but NMMNG was life changing.
I can definetely tell you that you'll feel much better even without getting sex. I haven't been laid in almost 3 1/2 years. Last night was the first time I was rejected and I didn't feel bad afterwards. I had been carrying a grudge my entire married life for it. I can even look back and figure out that I definitely drew that condition to myself.
But this morning she really tried hard to cuddle up and give me some affection. I can still feel the little shudder of uncomfortability in her body (not exactly sure why its there) but she tries. And it feels good that she is trying not out of guilt but because she wants to try.
It is going to take you time to change but you might as well start now. You'll be much happier.