You have my deepest sympathy, that's a terrible story! The only reason I can understand seeing you stay in a no-sex marriage is because (1) the rest of the marriage is extremely fulfilling and meets your needs and/or (2) the sex just isn't that important to you.
That said, it sounds like the sex IS important to you, and it's hard to imagine being in a fulfilling marriage with a spouse who claims to have NO desire for you and is in fact gay.
I have to ask why you would stay in that marriage? At the very least I think you owe it to yourself to do a trial separation to make sure that staying is the right decision. If she's gay, she's gay, that's not going to change no matter what happens.
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