As for racing, heart, I have never done anything, really, because I never got any response from any doctors about what to do. They said I didn't have a problem. So I assume it has to do with adrenaline which kicks up mostly when you get excited or have a novacane shot at the dentist. I avoided those shots. My heart raced when I went to bed and relaxed. It hasn't been doing that since I have changed blood pressure medicine. My new medicine makes me sleepy or not wanting to get out of a chair. I am getting depressed in this isolation period where I am not being supported and encouraged by my absent friends. I wish I could physically exercise more. My daughter brought me some fresh, locally grown tomatoes and that cheered me up. Mine are gone for this year. Dorisena

https://www.livestrong.com/article/503879-vitamin-deficiencies-racing-heart/