I had tongue cancer with 7 weeks of radiation and chemo ( cisplatin) simultaneously. I was tired a lot. I was lucky and did not get mouth sores or nausea. I used the baking soda rinse liberally. I did get a g tube and maintained my nutrition and hydration. The whole saga was not as bad as I had expected it to be. I was very worried going in. I stayed at home mostly so I wouldn't pick up a cold or flu.