Severe pain eating 7 weeks post radiation: Any tips?

Hi all,

First-time poster here. 40M, stage 1 P16 / HPV+ tonsil cancer. Completed 33 fx, 70 gy proton radiation about 7 weeks ago. No chemo.

Problem is, the treated back corner of my mouth and soft palate are set off into a fury without much provocation - 8-9/10 pain that leaves my nose running and eyes watering - think hot nail being pounded through the mouth. Eruption of clear painful blisters. It all subsides in 12 hours. Things that have set it off include a green smoothie with coconut water and spinach, Boost VHC drink; Orgain protein drink...to name a few.

Anyone else have similar experience? Did it get better? I'm trying to subsist on a diet largely of neutral dairy products, oatmeal, and bland soup. Hardly enough to sustain myself because "real" food is either too hard to eat or the taste disagrees with me to where I can't eat it.

Oncology team where I was treated (a global center for cancer) does not seem to care; it seems that unless I am found to still have cancer then I am effectively on my own to manage this.

Very much appreciate any advice or shared experience!

Tom