Peter, you're "only" 75 pounds away from a healthy BMI. This year.
Next year you can easily be "only" 100 pounds away.
The year after that, maybe "only" 125.
Where does it end? It's progressive, it's life threatening, and it can be fatal. She doesn't understand that NOT taking action could easily make her a widow. She needs to wake up and accept that you need a hand getting your life under control.
I carried around that extra 75 or 100 or 125 pounds for years. I ignored it and felt the side effects of not being able to be healthier. I became a spectator in my life, while I wasted years waiting for things to magically be better. I finally decided I didn't care what others thought, it was high time to take control of the situation. I had my surgery five months ago, and in such a short time, I have my life back. I'm down over 80 pounds, my blood pressure is well within limits, and my lab work says I'm in the Normal range for everything they tested. I eat right, and I exercise four or five days a week. Before surgery I didn't do either of those things.
If you can do the surgery, I recommend you go for it, and not waste any more time. My ONLY regret about the surgery was that I didn't do it years ago.
Good luck!
Dave