What are some natural remedies to help chemotherapy nausea?

Ginger? Ginger can help mild nausea, although chemo-related nausea is much harder to control without medication. Chemo stimulates the "vomit center" in the brain, and the anti-nausea drugs we have today block that site in the brain, which is why they work so well. Accupuncture is a helpful addition to nausea treatment for some people.
Ginger etc. Ginger has been used for thousands of years to treat nausea, stomachaches, and diarrhea. In addition, peppermint and peppermint oil are good for nausea relief. One also may consider to try accupuncture, or accupressure to help nausea.