DJBlod is exactly right. People, like me, who suffer from anxiety and/or panic disorder, have a tendancy to suffer these types of chest pains, also known as DeCostas syndrome.
Named after the physician who discovered it after WWII.
Dr. DeCosta observed many soldiers with the same symptoms, but they were fine cardiac-wise.
Get the book THE ANXIETY DISEASE, by Dr. David Sheehan....it is a great paperback that explains this and other anxety problems. Dr. Sheehan is a world expert on the disease.