How about a feeding tube? Your body can't fight and recover without the proper hydration and nutrition. The affects of treatment don't end because the treatments do.

Wanda (47) caregiver to husband John (56) age at diag.(2009)
1-13-09 diagnosed Stage IV BOT SCC (HPV+)
2-12-09 PEG placed, 7-6-09 removed
Cisplatin 7 weeks, 7 weeks (35) IMRT
4-15-09 - treatment completed
8-09,12-09-CT Scans clear, 4-10,6-11-PET Scans clear
4-2013 - HBO (30 dives) tooth extraction
10-2019 - tooth extraction, HBO (10 dives)
11-2019 - Left lateral tongue SCC - Stage 2