I am having trouble eating and can eat small portions every 6 to 8 hrs. I have pain under my ribcage which increases after eating. After eating, I have BAD back pain which starts at my upper back and proceeds down. I can only eat after the pain subsides some or I will be in Extreme pain. I have lost 18 lbs in a year (I am 84 pds now). What tests would be done to find out if it could be pancreatitis? I am a Crohns patient & my Dr has ruled out the crohns being the problem. As a matter of fact, my gastroenterologist said (after many tests) he finds nothing wrong and walked out the door. I was crushed.