I m experiencing chest pain, shortness of breath, lightheadedness, sweating and pulse of 140-148 in the last 20 mins. I m pale and pouring out sweat. My stomach also hurts. Its been on/off like this since yesterday. I can t afford to keep going to the hospital. I have EDS, chronic pain, a PFO, and cardio/pulmonary AVM. Does this sound like POTS???