Every insurance is different in what they want you to do to qualify for surgery, so you'll need to start with them first to see what you need to do.
But IMHO seeing a dietician whether or not your going to have surgery or not is a good thing, it can set you on the right track.
So to answer your last question.... start by seeing the dietician, keep your doctor in the loop and go from there. Its a good start.
~ WORRY LOOKS AROUND, SORRY LOOKS BACK, FAITH LOOKS UP ~
Courage doesn't always roar.
Sometimes courage is the quiet voice at the end of the day saying,
"I will try again tomorrow."