thank you Sarah4 for your reply! I too have hypothryoidism, H-pots, chronic swellings and muscle pain. I also had a mixed connective tissue disease diagnosed 20 years ago which now my ANA and sed rate are normal and it is considered "in remission". and lest I forget, the Addison's(adrenal failure). I also had a head injury right before the POTS symtoms started 6 years ago, so maybe that is related,too. I already take Nature-throid(natural thyroid), Cortef(addison's), Zyrtec and Benadryl, Pepcid C, asperin, Lyrica 25mg(leg pain),Percocet for migraines and days the muscle pain is really bad. I would like to try the Midodrine, but my cardiologist is hesitant. Other things that cause vasoconstriction help me like coffee, compression hose, ice, and my migraine medicine Relpax helps too. I will talk to him again about trying a small dose. Going to see my neurologist Monday as I have gotten so weak. My muscles have no strength. I also have trouble with LOW potassium and magnesium. I take supplements. What kind of doctor did you see to help you with your POTS? Thank you again for your help!!!!!