This is my first time using this. I appreciate any and all help that can be given to me/my dad.

My dad has been recently dx with Stage IV squamous cell carcinoma of the mouth involving 4 lymph nodes. He has recently (Jan 08) undergone surgical removal of the mandible and lymph nodes and currently doing radiation tx (finished 12 treatments of 33). First he had scar tissue in the left cheek which caused swelling on the left side. Now this swelling has left the check and is in the throat area. He describes the feeling of having broken bottles pieces moving in the throat area. It is particularly uncomfortable when he talks alot. Help! Has anyone gone through the same or similiar experience that can help my dad. Thank you.
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Anxious caregiver
P.S. My dad is 63 years old. He has Stage IV squamous cell carcinoma. He is currently undergoing radiation treatment at Memorial Sloan Hospital(had 13 treatments thus far). Chemo was offered in conjunction but refused. He takes oxycodone for pain management and also percocet (when pain is really bad). He has spoken to doctors regarding pain but they think it is just the scar tissue moving around. As I stated earlier, my father describes it as broken glass moving around in throat area. This scar tissue/lump moved from cheek to the throat area. Pain medication is not really working because like my father said it is an unexplainable pain/discomfort that causes him to shiver at times. Any info would be appreciated.