Worried About Abdominal/Pelvic CT Scan Results : Possible Mass In Head of Pancreas

I went to my family doctor because I was experiencing flank pain and blood in my urine kidney stones were suspected. I was sent to a urologist who ordered an abdominal/pelvic CT w/wo contrast.The results: Dilated Bile Ducts, Common Hepatic Duct, Common Bile Duct and "Possible Mass" in the head of the pancreas. I am scheduled for an MRCP this week and I had additional blood and urine tests. I do have gallstones which were seen on the scan and I've had Type II Diabetes for a few years and it is well controlled. I don't have jaundice, enlarged lymph nodes, dark urine, or weight loss.

I do have occasional fullness and diarrhea, but this has been going on for years I've had stomach ulcers years ago. I am really shaken by these results and I did ask the urologist should I be overly concerned and he said he I shouldn't panic personally, I am panicking and I think the doctor wanted me to remain calm until I have the MRCP scan. Should I be overly worried about these findings?  I'd appreciate any input or advice.