Michele, when I had Cisplatin and felt urpy, I used oil of peppermint under my nose and that helped a great deal. I know this doesn't work for everyone, but it is an inexpensive fix if it does. Available in the baking section of most stores.
I am pretty sure it was the chemo that upset me, and not the rad. None of the other rad patients who I got to know during my 37 treatments, most not on chemo, had any nausea.