I'm female,21 years old, low blood pressure, good diet (vegan), low cholestral, and i run about three miles per week so get plenty of exercise. I felt a sharp pain in my chest last thursday and then afterwards it felt like there was a tight band around my chest area. This has been on and off now for nearly a week, sometimes the pain radiates down my left arm and left shoulder. Ive monitered my heart rate throughout and it rarely goes over 70bpm, the only symptoms is this pain....i can't sleep on my side cause it feels like a crushing senstation. Does this sound like a possible heart attack?