Hi, I am currently being worked up for dysautonomia. I do not get tachycardia upon standing, only during exercise so they have ruled out classis POTS. So far my test results have shown a few things. After wearing a holter they found my heart rate gets in the low 40s at night and up to 190 during exercise, this is after sticking to a strict exercise program for 7 months. My exercise test came back ok (other than the HR) accept for a blunted blood pressure response to exercise. I used to be a competitive runner, but if I try to exercise I am short of breath, sweat profusely and get weak and nauseous. Also my laying to standing norepinephrine was 237-717. Does any of this sound familiar to anyone? I am most symptomatic after I drink my morning coffee, even with added protein and again in the late afternoon. This all started almost two years ago. I would have severe disabling symptoms for several hours and then they would disapate and disapear by late evening. Now the symptoms are not as severe, but can be more constant. I have other issues going on that point to a more systemic problem, but this is a piece of that puzzle. Thanks!