Jamie, I am saddened to hear about your wife being so against this. My wife was mad as hell when I told her, and I did not give her a say in my transition. I was on HRT for several months before I told her I had started. My HRT doctor suggested a therapist, and amazingly enough the therapist's husband had transitioned (MTF) several years ago. Their marriage did not survive, but it certainly gave her insight into the situation. Every time it looked like things were falling apart for us I asked my wife if she wanted to leave. She always said 'no' and told me that she loved me. My wife is happier now than she had been in many years. It is hard when the person you love can't see the pain in your life and recognize that you are doing this for them, as well as yourself. How can your partner be happy when you are in pain?
If your marriage does come to an end, please consider it to be a new beginning. Love will find it's way back into your life one day, and you will find a partner who loves you for who you are.
Love always -- Jessica Rose