Oh Greeneyez, I am so sorry to hear this. I'm an SO too. My partner is MtF but we're still in the 'pre' everything stage and it's the change part that scares us both, my big fear is mostly her wanting something different than, well, me I guess.
I hope everything goes well for you, one way or the other, but I think you should stick around, very supportive community here. If you ever need an SO to talk to don't hesitate to drop me a line.