Hi,
Better safe than sorry. Talk to your doctor. They may set you up for a stress test. Stress tests usually involve hooking you up to a monitor while you run on a treadmill.
It could be a simple nerve problem, but dont leave it to chance.
Take care.
I guess it would help to say that i am 21yrs old, 5'4" and a little over 120lbs. I work out some but not too much and i try to eat fairly healthy (whole wheat bread, fruits, ect..), i love sweets too but i try not to over do it.