throat pain

Hi there, its me again. I am13 week post chemo/radiotherapy for left tonsil and right left lymph node cancer. I am continuing to have nipping pain on the left side of my throat where the tonsil was radiated. My throat was slightly bleeding last week but seems to have stopped now. I am eating much more, which is good but have noted increased pain. I have spoken to my oncologist about this and she did not seem over concerned. Another factor is that I have noted the increased pain since ceasing fentanyl patches 12 mcg. I was wandering if the area where the tonsil is, is struggling to heal and also if I have come of fentanyl too early given 13 weeks post treatment. I am continuing to with morphine and pregabalin. The rest of my mouth is quite clean now but I am nattering that the cancer has not been eradicated in to tonsil area. I also have my PET scan on the 30th March so wandering if I am starting to get pre-scan anxiety. I was wandering if it usual at this stage to have a particular area that remains painful and also wandered if I have ceased fentanyl too early. Sorry if it seems a lot of anxiety in this post. Cheers.