Its important to know what kind of chemo he is receiving. I had Oxalyplatin intravenously and then Zeloda pills for 2 weeks, with 5 total treatments. I was extremely sick at first, mostly from all of the different drugs they were offering me. Zofran seemed to help until I started taking chemo, then I would vomit the Zofran every time. When I finally figured that out, I quit taking Zofran.
The chemo helped to shrink my stomach tumor, but after 5 rounds of chemo I said enough was enough. I was getting sicker each time I had chemo. The cancer came back, but the doc said that it probably would. Its the nature of the beast. I'm 14 months from my poor prognosis and living with the stomach cancer through eating what my stomach likes (alkaline diet), taking supplements that my stomach tolerates (no oily capsules), taking extra iron from anemia (my stomach tumor is bleeding into my bowels), help from Hospice and research. I take Essiac tea, fresh vegetable juices & Chinese remedies. I get acupuncture, sound therapy and massage therapy which all help to heal.
While taking chemo, I was nauseaus and sick a lot and couldn't figure out what foods my stomach could tolerate until 2 months after the last chemo treatment when the effects wore off enough. I'd be glad to give you more details and help you as much as I can, just ask questions. One of the most important things is he has to be a fighter and not give up. The doctors don't always know what the best advice is, as everybody's bodies are different and we all react to drugs, therapies, vitamins and diseases in different ways.
Good luck, Becky333