Was your CT scan just of the pelvis or did it include the abdomen? If the abdomen was included, the pancreas would be included and would show a tumor or cyst. You could be having problems with the gall bladder that aren't stone related called biliary dyskinesia. Good luck!
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No, you may not be having pancreatic cancer. However, since there is diarrhea of yellow color, get liver and pancreatic function assessed and the stool tested for infection. You could have mild liver dysfunction or mild hepatitis.
Other causes are irritable bowel syndrome, celiac disease, Crohn’s disease, malabsorption syndromes, pancreatic diseases, diabetes, hyperthyroidism etc. If celiac, Crohn’s and other problems have been ruled out then lactose intolerance and IBS are the possibilities. Gas in stomach, burping, diarrhea all go in favor of IBS. Pancreatic enzyme disorders, liver dysfunction, HIV, cancer of the gut, and infections by parasites other than giardia can all cause persisting diarrhea. Lyme and lupus are other possibilities that present this way. Please discuss this with your doctor (GI doctor). Take care!