I have pain in upper abdominal area, around the base of the sternum. Constant, now radiates through to the back. When I press on that area I get nauseous, with copious saliva, but pain seems to abate some. Started 2-3 weeks ago, getting more severe/uncomfortable. I have had a cold for a couple of weeks and have taken more ibuprofen than I usually do, but no more than 2-3 per day (200 mg each). Had gallbladder removed years ago. Appetite lessened but am able to eat. Could this be liver or pancreas problem?