So I've been dealing with Anxiety for a while now and a week ago I decided to be on Zoloft and Xanax. 3 days after I had the worst experience of non-stop unnaturally aggressive painful panic attacks. I couldnt sleep or eat for 2 days. I immediately got off both of them. Now I feel fine- I didnt have any panic attacks today, nor did I feel anxious today. But when standing up my heart rate is 150 (all day) and when im sitting down its like 96. My therapist said that i have nothing to worry about and is going to make me run on a treadmill tomorrow to prove it. Do I really have nothing to be concerned about and an anxious person like myself should not have galaxy S5 phone with a heart rate thing? Or should I go to the ER again for the 100th time this month? btw im 26 and thin. I mean isn't it weird that I have a 150 heart rate and feel totally calm?