Yowza! The jaw pain is worrisome. Nothing down the arm or in the shoulder blades? Weren't you going to be wearing an event monitor?
When mine is pain it's a gasping, sucked my air away pain that is mid-to left side, down the left arm, around to my back, shortness of breath. I've had a cath and everything looks good.

When my IST (inappropriate sinus tachycardia) acts up, that makes my heart race--180-190 just sitting is not unusual. My heart beats excessively hard, through a turtleneck and sweater you can see it beat if you're sitting across from me. My ears plug up and I go from super hot to not. It also gets hard to breathe.