I wish I had something substantive to say. It sounds as if you are doing the right thing in pursuing this with your doctor. You've had the usual diagnostic procedures. Sometimes we need to get a bit more assertive. The very sweet and casual doctor that I had for 20 years was always reassuring. Sometimes he was overly reassuring...missed some things, prescribed some contraindicated medications, etc. My employer switched our group insurance program...just in time. My new doctor is very thorough and she wasn't content, for example with blood Sugar levels. I am a much healthier person today for having made the switch.