Hi DeniseB,
No, the IMRT machine does not cause any pain on the table, although I found the sound of the IMRT machine was not very pleasant (I used to count the total time the machine was on as a diversion).
The side effects of the radiation will come with time. Rawness and pain in the mouth and throat, difficulty eating (I did not get a PEG), burns on the neck (blossomed very late and after the end of treatment). There are other side effects with the chemo (if he is having that).
The good news for me was that it was all manageable. Eating will be very, very difficult, not just due to the pain but also my taste buds were affected so that food was literally repulsive. I settled on a tolerable meal which I ate 3 times a day (you've got to get the calories, no matter what): eggbeater omelet with cheese (and sometimes ham), 2 Boost Plus, tea with honey.
Anyway, stay on top of the side effects, get medications that work (it may take a few different meds to find what works), get the calories and liquids, try to keep active.
Best wishes,
Chris