Hi Rene! I have been waiting for my account to get activated to reply to your message. I am newly diagnosed for POTS, sort of. One EP did the tilt table test and said I tested positive. He referred me to another EP who isn't so sure. I definitely have a hard time standing up for even small periods of time and my heart rate increases. Still waiting for the 24 hour urine test and blood test to confirm. I am also on a thirty day monitor because I am waking up to nighttime tachycardia. My story is a little weird and must be told to get to your questions. I started having SVT attacks in November. I was told they were the AVN-RT type. I had them weekly for a month. My heart rate would get up to 250 and wouldn't come down unless I went to the hospital for adenosine. Saw an EP who suggested lifetime medicine or an ablation which was supposed to be a quick easy fix. I chose to get an ablation. The EP wasn't confident he got rid of what he needed but said tie will tell. Three days later, I went to the gym to work out. Felt funny afterwards, went to hospital and found out I had a small pulmonary embolism. I probably got it from the procedure. That hospital was a difficult one for me. I started being sensitive to everything: benadryl, iodine, morphine. Also, during my visit, I had another SVT attack in my sleep which confirmed the ablation didn't work. My EP put me on Flecanaide. I was also put on coumadin (warfarin). I don't know why but I felt like crap afterwards. I thought it was the flecanaide so I wanted off of it and had another ablation a month later. Almost three months later, still felt like crap. I looked up the side effects for warfarin and it seemed like I had almost every side effect. I still have to take it for another two months so I am hoping that it will give me some relief. I think that is why the one doctor is hesitant to label me POTS because he think I need more time to get off of the blood thinners and allow my body to heal. So I have had similar experience as you but right now I am so confused as to what is what and why. I am trying to accept that I just don't know and may not for awhile. I will post again about this subject in July when I am off this dirty drug.