My diastolic # periodically goes over 100 while resting. My O2 rate drops to the 80s while walking. My EKG and sonograms, and Pulmonary function tests are all normal. I do have a positive ANA and Vestibular Migraine diagnosis. My cardiologist said, "I don't know why it's doing this. Perhaps you have some rare disease that we can't even help." That was the end of the appointment. Should I pursue this or let it go?