01/05/21 I when to the ER because my heart beat was really fast even though I was just sitting down (175bpm) my body started to shake uncontrollably I was also breathing heavy, I was so damn scared because I have never experienced something like this. test results came in good and doctor said I could have anxiety and he recommended me to visit a cardiologist but my question. Has anyone felt these symptoms before? I also feel slight discomfort in my left side neck/chest area