Hey Mike -
There are LOTS of us on here with complaints of chest pain.
I've had it on and off for almost 2 years now. What you are describing I have experienced time and time again - along with a host of other chest related complaints. I get a squeezing/tightening sensation right in the middle of my chest under my sternum frequently. There are lots of non-cardiac reasons for chest pain and I have been diagnosed with them all - GERD, chostochondritis, esophageal spasms, and severe anxiety :). Having said that, I did have a complete phsyical and appropriate testing done - including EKGs, blood work, and finally, a nuclear stress test.
I could hear the stress coming through your posts - trust me, I understand how scary it is. Definitely get your doctor to take all necessary steps to rule out any physical issues, but please know that there are MANY of us that have been in your shoes...