I gave up on doctors, and forgive them. They were not trained to recognize, understand and treat POTS, speaking of which there are no treatment, other than, in MY OPINION, re-training your brain. Accidentally or not, I found out about "amygdala retraining program" ( on CFS site: http://phoenixrising.me/treating-cfs-chronic-fatigue-syndrome-me/living-ii-mindfulness) and it all made sense to me. I watched 2 free sessions. I wish I lived in UK and could actually have a direct sessions with this practitioner. I want my life back and I can't wait to receive the material so I could start. Here is the link to You-tube sessions. First 3 are free, and he recommends to start with session #2.