Chronic Idiopathic Pancreatitis? Maybe not...

So my wife has been dealing for years with upper abdominal pain radiating to her back. It started after her gall bladder was removed during pregnancy and come back right at the 6month of pregnancy for all three of our children. Now it comes and goes several times a year. Her GI doc told her to take a supplement called SAM-e which has been helping a lot. However, she still has flare-ups about 2 times per year. The problem is that the pain seems to be classic pancreatitic pain but her enzymes are always normal or only slightly elevated. The GI doc thinks it may not be the pancreas. We are stumped and wish we could figure out what is going on. Anyone else have a similar experience?