for the past few months i have felt a sharp pain that seems to be right in my heart, i have under gone most all tests imagined. the final result an abnormal heart beat sometimes. nothing to worry about. but why to i keep feeling that, and why do i feel so stired after doing something small and silyl like cleaning the inside of my car. is this normal. i am a 37 year old mom of 1, and i admit i have not really excercised since having my 4 year old. prior to that i was at the gym at least 4 times a week. i hope someone can help me.