This is a very common side effect that depends a lot on the particular treatment and the individual. Fortunately, a number of drugs help treat nausea and vomiting and stimulate the appetite. Unfortunately, there is not a magic drug or combination that works for everyone.
Please see Anti-nausea/Diet for some dietary tips on dealing with nausea.
When YCS board member Karen¨s husband Mark¨s nausea was really bad, she would give him a medium dose of Ativan (a commonly used anti-anxiety drug that can calm your anxious spouse and also help with nausea), and then he¨d take a long nap. Usually, he felt much better when he woke up.