Hi your sons condition is very closely related to what my mother has gone through. Its hooray at the moment because her radiotherapy ended on Thursday 20th march. I am finding that mum is being really stubborn when it comes to pain relief but I do persevere until she has it.
Her neck has become inflamed and they have made a makeshift collar for it to prevent her clothes from rubbing against the area. What pain meds did your son use?