I have not been diagnosed with POTS but am in the testing stage for it. I have had a positive tilt table test with a local cardiologist but they can not find any issues with my actual heart to explain my passing out and light headedness/ dizziness and my sudden spikes and drops in blood pressure and heart rate. I have an appointment in a week with Mayo's fibromyalgia clinic because I was diagnosed with that 20 years ago. The POTS clinic also reached out to me based on my symptoms to come see them in the middle of July. But at this point I feel like both of these things are problems of some other underlying cause, such as an autoimmune disease or a nervous system problem of some sort.