What was her vow? "I take this man to be my lawfully wedded hussband" right? You pledged yourselves to each other as man and woman, and that comes with responsibility, imo. I'm not saying you shouldn't try to express your femininity...ughh, I'm with Sad Panda on this, these threads, I feel badd.
If my dad transitioned I probably would never talk to him again, I just couldn't. Id want him to be happy, but I cpuldnt deal and id be loyal to my mom in that situation. Same goes for any potential BFs. Being ourselves is good, yes, but if you're married and/or have kids you're responsible to someone else. I think if you knew your gender identity at the time it was quite unfair to marry her, but that's my opinion.
I don't judge anyone, but you're asking for our opinions, and while I care about and empathize with your pain your wifes matters too. She's thinking about killing herself. Maybe it's because to her, Sonia is killing the man she loved and married and maybe she doesn't want to live without him.
When you pledge responsibility to someone that means not always knowing what's ahead but being there anyway..the only problem on her end, is she feels like the person she pledged herself to is fading and that she doesn't owe this new one anything. On your end, I think you need to find a compromise you can bth live with.
I'm sorry I can't say "she's a dramatic b-ch" or "she's just selfish" cause I don't believe that at all.
Good luck sug!