*hugs*
Stress IS a major contributing factor to ill health, and to mental health decompensation as well, so while it's not her "fault"... this situation is almost certainly genuinely making your mental and physical health deteriorate. For that alone, you have so much sympathy from me. It sounds as if you're trying to cope, but you have simply too much to handle right now. I know this is a trite suggestion, but try one day or one hour at a time for a bit; you don't have to come to terms with her transition instantly, and it is absolutely NOT fair for her to expect you to adapt at her pace rather than yours. I'm not sure what it is you'd like to talk about, but I've been where you are and I'm willing to try. My wife transitioned in 2009, and the first few months were frequently pure hell, including plunging me into a suicidal depression. We are happier than before and still together now - but it wasn't easy and it was a lot of hard work. Is there anything you'd like to ask? I'll answer pretty much any question if it'll help.
(Also, from your other post "I have told my so I can't leave her as she would be alone and I couldn't do that to her. I really need some advice." My advice is : don't hesitate to put your own needs and survival first. You cannot help her if you're drowning, after all. Taking care of yourself is, in a roundabout way, also the best way to care for her.)