I'm 20, male and this started about an year ago. Whenever I feel stressed or anxious, such as on the day before exam, while waiting to go to a hospital or even when I assume I'm panicking, my heart rate becomes high an I could feel it in my chest. I once consulted a doctor and he diagnosed me with nothing but stress and elevated heart rate. I was given a mild medication and he said there was nothing to worry about. Recently I went to a hospital for checking a healing insect-bite wound. Everything was going well, but I was too scared about the process that my heart went beating at a high level (pulse was 100 I guess). They were confused until I told them my case. Are these events normal?