A couple of months ago I was out eating with my boyfriend, and everything was going great we got our food, I took a couple of bites.. and then I started getting a weird pain from my chest shooting up my neck and across my left shoulder and down my left arm. it hurt terribly bad for a couple of hours and I didn't even eat. we just went back to his place and I laid on the couch. A couple of days ago, I had the same type of pain but it only lasted about half an hour, and it only hurt my chest, neck, and shoulder on my left side again. What could this be, is it heart burn?