When laying on your back on the floor, as Ocelyn suggested, use a miracle ball or a towel roll going down your spine to really stretch out your spine.

It is a very weird sensation. When I get it, it goes up to the left side of my face and down my left arm too. Kind of freaky because it mimics the symptoms of an MI. I'm overweight with high blood pressure and cholesterol, so I'm kind of a candidate for that. I've taken the aspirin too on more than one occassion "just in case"

I wouldn't panic, but I'd definitely report it to your doc. It wouldn't hurt to have a baseline EKG on file.