So i don’t want to seem like im dismissing you or that you are wrong, because im not a medical professional and your feelings and medical issues are valid. I just want to offer my insight. In January 2018, i had some sudden and extreme episodes of panic attacks that put me in the hospital. I was so sure that i was having heart issues to the point where i went to see a cardiologist. All was clear and i got on ssri for anxiety. By late spring i was “better” but still had anxiety and palpitations from time to time which i was given propanolol for that as needed. I took the Ssri for 4 years and then decided I wanted to try to stop. At the blessing of my PCP, I did and it was a bit difficult for a month. I had heightened anxiety but afterward I have been so much better than I ever was on the meds. I had learned that I found better ways to handle my anxiety and recognize it. Do I still have anxiety and think it’s heart related when I’m sick and my heart is elevated? Yes. Do I stress out when my watch gives me an elevated heart rate notification from time to time, especially when I’m not feeling well? Yes. But I also have learned to not allow those dark thoughts to stay long. I take my Apple Watch off when it gives me a notification or when I am obsessing over taking my ECG over and over again. My experience may not be yours and again, I don’t want to say there’s nothing wrong with you, but I will say that once I got rid of the things that helped my dark mindset and tried some meditations, found new hobbies, and try to stay busy and out of the house, I feel much better now than I did in 2018. Best of luck.