At least in regards to surgery, y'all realize it just genuinely is more dangerous to receive surgery as a fat person, right? Anesthesia is already a delicate balance, and the more fat there is to metabolize it, the thinner the line between not waking up during the surgery and never waking up again becomes. Any sort of surgical wounds heal much slower and worse, since it's basically impossible to sew fat back up.
And look, doctors really don't want you to have to spend money, especially here in the USA where healthcare is incredibly expensive. Losing weight does help alleviate the symptoms, and if there's still a problem, the medicine will likely be more effective since excess amounts of fat cause issues with absorbing medicines.
This isn't a moral judgement on being fat, but please, for Christ sakes, listen to your doctors.