"The only mistake I made was supporting her dream to become a physician."
I agree with Mr. B on this one Lost!.....and his questions you do need to think about.
At some point Lost!, you have to ownership of what was your part in this marriage...whether it was good or bad. At the moment you are making it all about your wife, yet nothing about you. What was your part....and I don't mean paying the bills, because we got that. How do you communicate? Do you listen AND hear? How are you with your daughter? Think about this stuff....it takes time to honestly answer yourself in the mirror.