Hi, so sorry to hear of your difficulties! I went through same treatment with my cancer which at that time was not in my throat but my neck. With a lot of unparalleled diagnosis they finally gave me a PET scan which showed up a quite large Tumour running from under my jaw down the right side of under jaw towards the larynx and had at that stage reached the lymph nodes as well. Anyway 35 rads and chemo for the seven weeks as well as the old Peg for feeding for 3 months.
I actually felt not bad at that stage. But then the pain started up again Tri geminal neuralgia. Lots of pain meds and some even aspirated as glottis didn't always want to close up. Then the whole mucous thing started about 6 months after treatment. That has progressed to a as you have it chocking problem. Unfortunately as I have found out there is no cure for this (apart from mine) and will continue. The Doctors have just given up on me.
The constant chocking and coughing has irritated the Larynx so much that I feel it has now caused the cancer to pop up in my larynx where it never was before. I had a biopsy last week and will be phone appointing with the ENT surgeon tomorrow to learn my already known fate.
I sincerely hope you find some peace and resolution.