Don't confuse desperation and strength.
There really is only one question, and that is whether you will be able to sustain the current situation. Unfortunately, there is no way to answer that.
Having had those feelings myself, I can say that sometimes things work out differently than you can predict. I struggled for a long time with feeling terribly constrained and it was coming out in destructive ways that don't need to be detailed here. But I am transitioning, my wife knows that now with certainty, and we are still together. Moreover, it took a very long time to start to get past the feelings of loss and betrayal to some measure of concern. (Not that there isn't still plenty of the first two ...) I don't believe in marriage martyrdom and I certainly don't believe in suffering for suffering sake, but were I able to look forward at that time to that happening, it would have given me more strength to bear the pain.
Much of what you do has to be based in an assessment of not just your relationship and it's basis, but a pretty sensitive reading of your wife's psyche as well.