I will ask my doctor about POTS the next visit I have. Thank you for the info!!!
http://www.cfids.org/about-cfids/orthostatic-intolerance.asp
From the symptoms section:
The blood pressure and heart rate changes in NMH and POTS are accompanied by orthostatic symptoms such as lightheadedness, dizziness, nausea, fatigue, tremors, breathing or swallowing difficulties, headache, visual disturbances, sweating and pallor.