Fatty tissue on the Pancreas

I had a CT scan of the abdomen a week ago and the doctor was looking for issues with the pancreas, gall bladder, large intestine and stomach. I've been suffering with pains in the upper and lower left quadrant of the abdomen for about a month. I also had a HIDA scan for gall bladder function. According to the HIDA scan, the gall bladder is functioning when it wants to, not when its supposed to so it'll have to be removed. The only thing that was found in the CT scan was something that looks like fatty tissue on the pancreas. Also he wants me to get a colonoscopy. My questions are 1) Could this fatty tissue turn into cancer? 2) Why do I need a colonoscopy when I'm going to have my gall bladder removed? I do have a belly button hernia but they couldn't find any trace of it on the CT scan and I have a history of adhesions and no one is listening to me since this pain is becoming excruciating....