based on your history it is not exactly suggestive of a heart problem..it looks more like a problem with your chest wall and muscles..would be better if you could give bit more history:
-does the pain appear while working or anytime, is it associated with excessive sweating
and generalised weakness, and is there any history of heart problems among your family members.
-does the pain increase on coughing or laughing out loud. does the pain appear on putting pressure over your chest. was there any history of injury
to your chest when you were young.
-with the chest pain
do u get fever
each of the set of questions mentioned above rule out a specific system..so kindly go through and we can come to a better conclusion.