Welcome to our family forte2465!
You've found the right place for support and encouragement for the FAT To Skinny lifestyle.
My wife once had a terrible problem with edema.
However, eating low-carb for several weeks has helped her immensely.
It's gonna be tough living the F2S lifestyle while eating bananas.
I wonder why your doctor insists on them and not supplements or other low-carb foods?
Ask your doctor if taking a potassium supplement along with some low-carb food would work for you.
Or maybe eating foods that are high in potassium (and lower-carb) like: avocados (raw), spinach (cooked), and tomatoes.
I hope there is another "doctor approved" alternative for you.
There are three types of "foods" that interfere with potassium absorption: high-sodium (salty) foods, caffeine, and alcohol.
I'm sure your doctor has told you to avoid these.
Whatever you do, please stick with your doctor's orders.