Heart Attack Support Group
Heart attack is a serious, sudden heart condition usually characterized by varying degrees of chest pain or discomfort, weakness, sweating, nausea, vomiting, and arrhythmias, sometimes causing loss of consciousness. It occurs when the blood supply to a part of the heart is interrupted, causing death and scarring of the local heart tissue.
However, GERD (gastro esophogeal reflux disease) has been known to mimic Angina (chest pain). Based on your activity I'd say that's a distinct possibility.
jaw call 911.