Welcome but I'm sorry you have to be here. As you can see I am a 6 year survivor of the same type of oral cancer you have. I didn't allow them to put a feeding tube in me until after my treatment was over. I am probably going to start the feeding tube war all over again but I am not in favor of getting the PEG but I am in favor of getting the nasal tube only when it's necessary.
You didn't indicate if you have some positive nodes but that's usually how
HPV+ SCC is found and most likely why you are getting chemo. What type and frequency of chemo are they giving you?
Have your teeth checked by a qualified dentist (one that's familar with oral cancer and it's radiation treatment) and get trays made for daily fluoride treatment. Start them ASAP.
Have your TSH tested in the next blood work they do and record that number for later on.
I don't card what your weight is but start eating all your favorite foods in great quanity, the fattier the better IMO. Have pizza and ice cream for breakfast if you want! You will most likely loose your taste and it can take a very long time before you start to enjoy eating again so eat up.
We will be with you and your caregiver 24/7 from now until you don't want us anymore. Don't hesitate asking anything.