My father-in-law finished his treatment (seven weeks of radiation, Cisplatin and Taxotere) for stage III base of tongue SCC about six weeks ago, and yesterday he started feeling nauseated again after having little or no nausea for at least the last month. It seemed like everything was improving (with the exception of the mucus and some unhealing mouth ulcers), but now, all of a sudden, he's feeling very unwell. Zofran and Ativan help a little, but he's still nauseated. He has a PEG tube through which he receives all of his nutrition (Isosource 1.5) and hydration, because he still cannot eat anything.

Anyone have any ideas about what's causing this and/or what I can do about it? I don't understand why he would be getting worse at this point! Please help.