Glenp, My heart rate is all over the place, too. Not so, my blood pressure which is always low. I'm currently reading Cort's article about Dr. Light and his suggested treatment. Going to take it to the doctor. The compression socks/stockings are another good idea.
Thanks to Sushi for clarifying the home test.
My reaction on the tilt table was immediate and severe. My heart rate rises very rapidly when I stand up. Wish I could find an autonomic specialist.