Pain, fatigue and no appetite: How can I help my father-in-law?

I joined this group for my father in law who is "old school" and doesn't speak very good English. I am his proxy and I joined this group in hopes that y'all can give me and my husband some advice on helping him feel more comfortable. Diagnosed with stage 4 pancreatic July 18th, already in abdominal walls. He still hasn't begun chemo and I can thank the healthcare system for this I'm sure.....but his appetite is pretty much obsolete and pain is over whelming. any suggestions on how to get him to eat or drink water more? Help