I'm so sorry you are going through such a stressful situation, but I'm glad you've reached out for help and answers.
I'm going to try and answer most of your questions.
1. Regarding your diet, I strongly suggest that you Google/internet search "Pancreatic Diet" as it's not just about keeping to a low fat diet. We are also to avoid sugar, salt, caffeine, alcohol and can only have nuts in small quantities. I bought several cookbooks/
nutritional guides and they have helped immensely. I taped most of the "Do's and Dont's" on a cabinet to help me and the family remember.
2. Diagnosing Pancreatic Cancer can be done with imaging such as a CT or MRI but the definitive test is a Biopsy and alot of cancers can be caught early. Finding the right Gastroenterologist is crucial, reporting your symptoms and requesting testing is the key. Be proactive.
3. New ways to diagnose? Specific Cancer Blood Tests can be done as well as fecal tests to determine if the likihood for cancer is present. Labs are a good starting point.
4. How to avoid another attack?
Staying within the Pancreatic Diet guidelines and avoiding Stress.
5. Does preventing another attack lower your cancer risk? Unfortunately no. It does keep you from experiencing an Acute episode of Pancreatitis which is almost unbearably painful however, but it doesn't change what is happening at the cellular level.
6. Grams of fat in the diet? Ask your GI Doctor what they recommend for you as the amount can be based on your current weight and will be different for everyone. I try to avoid all saturated and Trans fat on a side note.
I hope this helps to ease your mind and I'm happy to answer any further questions you may have. Take care.