I have had a discomfort in my upper stomach lower chest area in the center of my chest. I am still able to work and do other things. I have no other symptoms of a heart attack. I have been checked for this same feeling before about 3 or 4 time. I passed all of the ekgs and the stress tests. I even had a catherization done about ten years ago that showed no signs of any build up. I was checked for gerd and it did show a little back up in my esophagus but not reaching my throat. I take a daily prilosec generic. Should I be concerned that this is happening again?