Lavinia,
It is pretty common to have many different sorts of phantom pains and feelings after radiation and/or surgery. Nerves get damaged in this process. Even post nasal drip can give the feeling of something caught in the throat. You did the right thing, had a direct visualization. It is also common to be either a nervous wreck and/or clinically depressed post Tx -we can all relate to that! You can have some comfort that you are being followed at intervals short enough that if something WERE to occur that it could be dealt with in a timely manner. 4 months is still pretty close to your end of treatment date. It took a long time for my throat to heal post Tx. Radiation is a month of recovery for every week of radiation.

A clean "scope" is pretty much a "gold standard" exam.

If this is disrupting your sleep patterns or causes you anxiety I would recommend seeing mental health and get some help for that.

I just started taking "sleepers", 3 1/2 years out, for my own sleep disorders as a result of my cancer adventure. I am not embarrassed to admit that I am certifiably crazy as a result of this disease.