Upset stomach, hiccups, inflammation:
I didn't do well on Zofran. Mase me very constipated, which is very hard to get over between infusions. Now I only take 1/2 a pill before chemo. Metoclopromaide is a nausea med. prescribed: I take it only for five days (before meals). Dexamethasone, that ugly steroid: I take it in 1/2 doses (one pill a day, with food, for five days and 1/2 a pill on the sixth.
These changes improved my nausea, hiccups, and gas and burping. In addition, I've had no real issues with constipation of diarrhea -- something I REALLY struggled with, so much so that I told my oncologist that I would have to stop treatment.
I have no pain, but I have endometrial cancer, and therefore don't know about pain associated with ovarian cancer.
Food: I stay away from processed meats, as they contain carcinogens, and I eat very little red meat--if I feel tired I'll eat some stewing beef. High fat foods disagree with me, contributing to nausea and acid reflux and heartburn (same thing?). Fruits help a lot with both hydration and pumping vits. and minerals into your cells. Low-glycemic vegs. also are important.
Diary is low on my list of food choices, even though I it used to be my main source for calcium. I'll eat low fat yogurt and low fat milk in my coffee, though. Sometimes, I' eat some cheddar cheese with an apple.
These strategies may help you too.

I hope this helps