After my first diabetes doctor retired because of ill health, I went to one who had a good reputation, almost fame, in the medical community. I tend to be an unruly patient, somewhat wearing on doctors, so he farmed me out to his new Nurse Practicioner. She tried to boss me around, so I severed the relationship and found a new doctor with a less lofty reputation. I told her about my delayed emptying of my stomach, which I had been told was due to neuropathy killing the nerves to my intestinal tract. My new doctor wouldn't accept my word for the condition. She insisted on having it tested.
Testing involved eating a radioactive egg salad sandwich and measuring how long it took for the radioactivity to leave my stomach. We did the test and it showed just what I had told the doctor: food is slow to leave my stomach. She decided I was suffering intestinal neuropathy.
That was quite a leap, from confirmation of symptoms she hadn't believed in to a useless diagnosis that explained the symptoms but offered no treatment. Apparently that diagnosis was the official, sanctioned, expected, accepted diagnosis for those symptoms. I have since found two other diagnoses that seem reasonable for my symptoms. The first is a vitamin or mineral deficiency, which leads to a treatment by supplementing with the missing vitamins or minerals, and the second is a Candida infection, which leads to treatment by taking probiotics and avoiding consumption of carbohydrates, a low carb diet. My current primary care doctor monitors my deficiencies and suggests appropriate supplements; she also has treated me for Candida. At least one of the treatments has helped. I don't care which one.
Had I stayed with that particular diabetes doctor or others like her who blame everything on neuropathy, having no treatment options, I would not feel as well as I do now. I still have a long way to go to recover decent health, but I have made progress.
I have noticed that many problems produce roughly the same symptoms. Many of the officially recognized diagnoses for those symptoms lead to either no treatment or a totally useless, perhaps even harmful, treatment. Many doctors, those who follow the official guidelines, are either useless or a danger to their patients.
I used to get rid of doctors by living until they retired or died off or until either I or the doctor moved. That isn't very efficient.
It is much better to do some research, figure out what treatment is viable, and fire those doctors who cannot or will not offer useful treatments.
I've fired quite a few doctors in the past decade.