HI, I was having jaw pain a while ago and went to the doctors. They did a bunch of tests on my heart (echo, ekg, stress test) and everythihng came back normal. It turned out to be stress related!! However, I would recommend you get a full workup (ekg echo etc) to rule out anything serious...but just know that jaw pain doesn't always mean its heart related. This could be migraine in nature (tmj), stress, tooth problems etc. Try not to be too nervous but at the same time..I hope that you go to your doctor to get it checked out!