What STD did she contract? Is it something that will clear up, or something that is now with you forever?
WRT her feeling not good enough, or less than you. Sometimes that is because of you and how you act, and sometimes it has nothing to do with you and everything to do with her. I will echo what others have said -- time for some professional help!
I'm not a fan of MC in a WAS scenario, I think it has a nearly zero percent success rate when one spouse is already checked out. I think when it CAN work is when both people are open to making changes and giving it a try. If your W is saying she wants things to work, go attend Retrovaille or get some professional MC assistance.
Thinking that you can do this yourself is going to be a mistake.
Acc
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015