First, I am sorry to hear that you are so young. Even if islet cell is not as bad as so many cancer diagnoses, it still demands emotional energy and a watchful eye.
My husband's was diagnosed when he was 45 during surgery for what appeared to be suspicious colon cells. At that time they did a whipple procedure taking out part of his pancreas, stomach, colon, and spleen. It's curious--and worrisome-- to me that for yours, they did nothing during surgery with chemo/radiation as follow up. That is NOT the normal coarse of action. Do you trust both your doctor and your hospital?
If you are anywhere near Milwaukee, I would highly recommend Froedtert/Medical College of Wisconsin (Dr. William Rilling). That's where my husband's follow up has taken place for the last 7 years....very successfully, I might add. He has undergone a number of chemoemolizations, one therasphere treatment, two surgeries, and one cryoablation. No systemic chemo or radiation. Sounds like a lot, but remember, it's been over 7+ years. He looks and acts like nothing is wrong and he's now 17 (!) years older than you.
Did you know that Steve Jobs (Apple computer) was also diagnosed with pancreatic islet cell? I believe they resected his pancreas and he --for now-- is considered cured. (My husband's metastasized to the liver).
I hope that for now, that helps. Feel free to ask any other questions--general or specific. Best of luck.