I have a really good POTS specialist that I see in Dallas, TX. Dr. Amer Suleman. I don't know if you would want to travel that far though. On dinet.org, there is a list of doctors that work with POTS patients that are in all different states. Hope you can find someone!
It's not an easy thing to find, a POTS specialist and I think a lot of us are in that unenviable position of not having one our area. Have you checked these lists?
http://www.medhelp.org/tags/health_page/24603/Dysautonomia/Dysautonomia-Specialists?hp_id=717
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