I have a pain in the center of my chest, mostly to the left but sometimes to the right, especially when I lie down. I went to emergency room and had stress test and ekg and they were negative, nothing wrong in heart or lungs, but it is still persistent. Not bad enough to take a pain pill all the time, but I know its there. Sometimes I take a pain pill and an anti acid and that relieves it, but it comes back. Im getting worried