Kellie,
It sounds a lot like muscle spasms of the upper body - much like what those of us with thoracic outlet syndrome seem to get.
Do you feel like your upper body is kind of locked up?
does it feel like your collar bone is being pulled into your throat? { I had this feeling when my spasms were very severe and my top ribs were pulled up and got stuck up against my collarbones a expert PT was able to drop them back down- in one session}

many of us have had odd chest pain/tightness - mostly due to the spasmed muscles, there is a nerve that goes along there also - many did go to dr or ER for heart check and was found not to be heart attack.
But better to be safe than wrong about that.

we have threads of helps and suggestions on the forum.
heres one-
http://neurotalk.psychcentral.com/sh...elps+self+care

If it is spasms- some deep slow steady pressure/ massage/stretching might help to release it- but not too rough or too much so not to make it worse.