I had an EKG done when i was "ON" the results read "normal".
I also just recently (2weeks ago) had an ECHOcardiogram done. Its an ultrasound of your heart. I was a little nervous for this one, not so much the procedure but the results. This test is much more accurate then the EKG, it gives you a complete picture of your heart and how its working, wall thickeness, valves, ejection fraction, etc.
The EKG is just a set of 7 ( i think) electrodes they hook up to different parts of your body ( chest, ankle, arm, etc) its nothing. The test takes 5 minutes. It measures the electrical activity of your heart. From what i gather, something would have to be pretty messed up to show up on an EKG. An echocardiogram is much more accurate.