October,
You may already have the information below if not I just looked up google.
If no one can help you with local contacts, maybe you could contact the uk group, I did look for U S A and Australia also but didn't easily see any group.
UK group may be able to help you to locate specialists/even a visiting one.
http://www.potsuk.org
http://www.steadyhealth.com/articles/Postural_Orthostatic_Tachycardia_Syndrome__POTS__
Good Luck