m a 20 yr old female I have problems with SOB, chest tightness, palpitations, dizziness, all with a high
heart rate. I went to the doctor and was ordered a 48 holter
monitor. I was told I had runs of SVT on the monitor and that I needed a few more tests. So I had an exercise stress test done. I only walked for 4 minutes before my heart rate was 190. I had to get off the treadmill right after that. Should I be worried about this? Any ideas of what could be causing this to happen to me?