Be your own doctor learn how to take your own blood pressure, your own blood sugar, your own urine test, and a fit test this is a test to check for blood in the stool
All these test can be bought at the drug store. Start a small library on medical research or Google. There is a place for doctor and that is emergency medicine or surgery when needed but for chronic problems they have not a clue. They try to blame you, you have the ___ gene, or you over eat, or you don't exercise enough, or it is an auto immune disease. This is all a cop out so he has an excuse not to help you.