It must be very hard to have made this decision and be facing this life change without the support of your partner. I would imagine that is very lonely. I am an old married lady (been married since 1985). This kind of significant lifestyle change is disruptive to our family, even when they stand 100% behind the decision. Perhaps your wife is a control freak, but perhaps she is simply unable to put her concerns into words.
You do use language that suggest there are control issues, e.g. that you did not tell her until you had a surgery date because she would not have allowed you to get that far in the process, or afraid to say 'my body, my choice' because it would not go over well. At the risk of stating the obvious, you don't seem to have a whole lot of emotional intimacy in the marriage, and you surely don't seem to be able to communicate with each other. The years with small kids, big bills, exhaustion, and work/life balance issues are hard on EVERY marriage, now you are throwing in surgery and lifestyle change issues. Yikes!
I know you have a lot going on, major surgery, new baby on the way, small child at home, but I hope that you and she can find time to go to a good marriage therapist. Along with getting physically healthy, it is my hope that you are able to be emotionally healthier, and that you and your wife find the joy and love that brought you together in the first place.
Good luck!