@johnwes5819 You haven't had a tilt table test, then. UAB has an extensive autonomic testing department. I would call them and get a referral to someone in your area or to some place you can travel to. https://www.uabmedicine.org/web/medicalprofessionals/autonomic-testing-laboratory Or try Vanderbilt - they have a well-known autonomic dysfunction clinic. https://ww2.mc.vanderbilt.edu/adc/ 615-322-2318