Emily, so sorry to hear about your dad. I'm in a similar situation, except I can't be Dad's primary caregiver. He was diagnosed with a 2.5cm tumor in his pancreas over New Year's. He also has spots in the lymph nodes and liver. he chose not to take chemo. I agree with Onycrx- make the best of the time with your dad. Talk about the facts of his illness, but then move on to other things he's interested in. Help him make his last months/weeks meaningful.
Sorry I can't offer what you were looking for. I've searched for hours online, and spoke to the doctor who specializes in this. There's just not much they can offer. My dad did well the first month with a restricted diet, and pancreatic enzymes seem to help him keep eating. We thought he was winning, but then he grew weaker and has severe itching- both signs of advanced cancer. Now he's taking sleeping pills and a pain pill at night. We don't know how long he'll have, but I hope to be there for him in the end.
Take care, I will pray for you and your dad. I'd be glad if i can share the journey with you and somehow encourage you in your tough times. rt