Hello. I thought of something we didn't address, plus one PS about nausea, one about protein, and one about sleeping.

1. Please make sure that your father's doctors know about all of the medications he's taking, including the OTC (over the counter) ones. Some people with pancreatic cancer also develop problems with their liver, and many OTC medicines, vitamins, and supplements are hard on the liver.
. . . . . For ex., I can't take Tylenol (generic name acetaminophen) because my liver functions are high. And, my oncologist doesn't want me to take much ibuprofen (Advil, etc.), either; I didn't yet ask for a recommendation of some OTC pain reliever, and if I get one, I'll share it -- but it might not be OK for your father, so please make sure his doctors know about everything he's taking.

2. I don't know of any OTC medicines for nausea, unfortunately. My Rx for nausea are ondansetron (generic Zofran), which others have mentioned, and promethazine (generic Phenergan). Some people have been prescribed olanzapine for nausea; I don't know anything about it.

3. I used to eat a lot of beans/legumes, and if your father likes them, perhaps stick with the ones that have the mildest flavor, such as navy beans (small white beans -- you might have a different variety, with a different name) and red lentils (much milder than brown or green).
. . . . . There's a channel on YouTube, called Recetas de Gri, that shares a lot of recipes with beans, including meat substitutes, crackers, cake, and bread. The recipes are for very rustic food that's easy to make and that doesn't require lots of ingredients or take lots of time.

4. You mentioned that your father is having trouble sleeping because of a sticking feeling in his side. I'm so sorry -- I don't know what that means, so this might not help, but just in case: I take 1mg of melatonin at bedtime, to help me fall asleep. I also take a small dose of an OTC antihistamine (chlorpheniramine) when I wake up in the middle of the night and can't fall back to sleep. ***But please check with his doctors to find out whether it's OK for him to take either or both of these.****

Good luck.