Diagnosed with POTS in June 2008. Suffered for about two years prior to diagnosis, which forced me to give up nearly all exercising in May 2007. I also have hashimoto's thyroiditis and GERD. I have the hyperadreginic form of POTS and I spend about an hour a day researching trying to find the cause. So far I think it has something to do with my thyroid which has affected my adrenals in some way. DHEA is 4 times over the top and Cortisol is low. Also have low testosterone. Not sure if I'll ever find the cause but I pray this goes away or doesn't get worse.