Yes interestingly I remember well trying to isolate symptoms. I found that the location of the Heart adds to the confusion. Within a small area you have a few organs that can produce symptoms. As I had Heart Rhythm issues could be confused with Stomach and lung issues. So for me to isolate it was my heart was to check my pulse. This was a sure method i was either have heart burn or a heart arrythmia. Having a arrythmia your pulse actually slows to a stop as blood stops flowing. So the use of the Heart monitor was crucial sometimes in initial diagnosis.

Have they suggested a course of treatment? I was the opposite of you as I had Ventricular Tachycardia or rapid heart beat. I ended up with a pacemaker to help control the rhythm.