I'm so sorry, Sarah!

It hurts so much, I know!
I'm really unsure what to say - this thread really hits home hard for me - but everybody's given really great input so far. From what I've come to understand from a few of your posts, you have a wonderfully special T! I know you don't want to give her up - heck, I know I wouldn't if she were my T - so I think this is something you really need to discuss further with her!
I honestly don't feel that finding a new T would (ultimately) be best for you right now - and I know that you've pretty much ruled out the possibility already - but I agree that just looking/searching for other Ts that might be of some help.. just so you have an emergency fall-back plan (if - God forbid - it's ever necessary), and have a couple of people you could contact!