You've done an excellent job with the weight loss!
Not sure what's going on with some Dr's at the moment, but this is the third time in less than a month that I've heard the same thing. The other two people I heard it from were diabetic relatives, one of whom gave the Dr hell when the suggestion was made. Makes you wonder whether they have a new set of boxes to tick!
It sounds like you are doing a great job without the intervention of a gastric bypass, and not that I'm advocating not listening to your team... but I think you are wise and sensible enough to know what's best for you at this time where diet is concerned.
Is there any way that you can get a second opinion, or speak to another Dr?