Hi,I have had pain in my abdomen for about 15 years. I have had several tests done, to no avail. The pain is located behind the lower left rib. A little ways forward of my side. I have had 2 colonoscopies done, an MRI and cat scan. I have to take 30 mg of oxycodone twice a day, just to get it to a tolerable level. Does anyone have any idea what it might be?Thanks,Bob