I know it sounds weird and because I have no short term memory I cant remember what it stands for...anyway I have been having problems with my HR during this flare and it was making me feel dizzy,breathless,chest pain and the feeling of constant heart beating loudly. My resting heart rate is 100 when at rest and I only found out yesterday that when I stand up my heart rate goes right up to 140 or sometimes higher...then I was told that when that happens the blood pools in your legs so that is why it goes up so much b/c your heart has to work so much harder to get blood around the body, it is also associated with low blood pressure which I have. Apparently from what I have read it is quite common with cfs and when I was thinking about it I thought wow this makes sense this is the cause of some of my symptoms...I always thought that if your heart rate was as high as mine surely it would make you tired etc...and the brain fog, if the brain isnt getting enough blood then can cause memory loss etc. I have an apt with a cardiologist next week and I am hoping that he can confirm that I have it and then work on fixing it, it feels great( I know that sounds weird) to know what it is and that it can be fixed/controlled and that may help with cfs...also I dont know about anyone else but I always feel like a fake, like people cant see anything wrong so therefore you are lying...they never come out and say it, but you know....and it is much easier to explain that cfs, psoratic arthritis lupus and all the other things I have either had or been tested for. So has anyone been dx with POTS and if so how and what treatment have you had and has it helped?