I would have these symptoms for avg of 11 days after treatment. Please take time to rest. I know sometimes I pushed myself especially after surgery which wasn’t good thing. You’ll get there. I know my diarrhea was the worst as it would keep me up most night. Follow drs recommended ways to deal with it. Like taking diarrhea med they prescribe. For mouth sores, I got oncology mouth wash from Amazon which would give some relief. Praying for you!