question: im a 24 y.o woman. generally active (run 5-6 times a week) but Ive been feeling fatigued lately and experiencing dizziness, shortness of breath, and chest tension. My normal blood pressure is 100/70 and resting heart rate of 55-60 bpm but ive been measuring 100/60 lately with a resting heart rate of 48-55 bpm. Should I be concerned?