My pancreatitis was acute and “drug induced”, from the mesalamine I had been taking for ulcerative colitis. The symptoms were primarily pain on the left side that radiated upward; stool was lighter in color. When you have UC, you’re more aware of stool than anyone should ever have to be...lol. The pain was constant and became more noticeable after I ate. I contacted my GI doc after almost a week and the only test that confirmed the pancreatitis diagnosis was the bloodwork (lipase and amylase were elevated). Once I discontinued the mesalamine, it resolved within a week. Now I’m scrambling to get the UC back into remission and currently on Uceris (budesonide) which so far is not helping. A few years ago, my husband had pancreatitis from gall stones and that pain was excruciating, left side right through to the back. He couldn’t even stand up. A trip to the ER and an emergency cholecystectomy followed. He has had no issues since. We too have never smoked, do not drink alcohol, walk 5 miles a day and have always been in excellent health. This ulcerative colitis has been a nightmare and I am terrified of the biologics, but living like this sucks. Good luck to you! I’m sure some bloodwork and an ultrasound, CT scan or MRI would render a diagnosis! You’re young, and I’m so sorry you’re going through this. Good luck with the diagnosis and treatment!!