I am 17 years old and I have been having many problems with my heart since I was 15. I am in great shape and very healthy but I do have a heart arrhythmia, which my doctor told me is common for girls my age. The only problem is that my chest will begin to hurt and my heart rate goes from 60 beets per minute to 105. Then it will begin to hurt to breath and it becomes hard to get my breath back. I will also feel dizzy and drained after this moment passes. It happens about 3 times a month and it can happen randomly. It seems to happen more often after I exercise but it has happened from sitting down and relaxing. Should I be concerned?