GERD is the most common non-cardiac source of chest pain, followed by musculoskeletal referred pain. I thought he said it wasn't provoked or associated with food, but i guess he didn't. (gastro-esophageal-reflux-disease=GERD).
Some Sx of a heart attack:
Impending sense of Doom
Crushing/gripping chest sensation (not necces pain)
Pain radiating down arm
Difficulty Breathing
excess sweating
Angina attacks are more of the same but relieved by rest, asperin, nitro, brought on by exertion, and last only a few minutes +/- 10.
Musculoskeletal pain could be from a rib, sternum, clavical, scalenes, SCM, intercostal mm, pec maj/min, diaphragm, abdominal mm, etc etc etc.
When in doubt go to the ER!