I have had this constant pressure in my upper abdomen, right below my ribcage. It also tends to move into my chest so I have such great pressure that I feel like I can't fully breathe. I've seen many doctors and a GI and all tests have come back negative. I have done stress test in my heart, was normal, xrays normal, artery scans normal, gallstones and a hiatal hernia checks all good, I've been on antacids for the entire month, but they have not helped at all. I was taking Motrin 400mg three times a day for a possibility of Costochondritis, the discomfort has been reduced, but not gone, at times it is worst than others, usually when sitting for too long. Many nights now, I felt my heart pounding for a short period of time rapidly, about three times that happened, not sure if related.