Not sure if this is helpful, my Husband’s CT w/ contrast did not show his Pancreatic mass. MRI with contrast did, this prompted needle biopsy which confirmed PDAC, not sure if other Pancreatic cancers show differently. He was told that due to tissue density of the Pancreas that with CT imaging his mass was not visible and typically only would be visible due to the affect the mass had on surrounding tissue. He also received MRI due to an elevated CA-19, a blocked bile duct and his family history (a Maternal Aunt and Mother who had passed due to PDAC) I can understand your concerns with your ongoing symptoms. Continue to seek medical evaluation and testing so that they can hopefully find the cause. Praying for answers for you.