That is the normal course of treatment, as Don Foo did, after TPF Induction chemo, sequetional Chemoradiation, and is the only real cure in this type therapy, chemo is not. The two chemo's may be enough, many here could only do 2 out of 3 large bag Cisplatins also, and that was without IC or had their last weekly cisplatin stopped. The main thing is to finish radiation. chemo acts as a radiosebsitizer to make radiation work better, how much differs with the type of chemo from 2%-20%, maybe higher with other studies. As far as the peg, the nasal tube in an option, and often preferred during treatment, instead if surgery, so I don't know what the doctor is saying. Nausea can be a side effect of radiation. I did radiation alone, and had nausea, vomiting, although pain medications also had a role too. Some patients even have anticipatory nausea just entering the room, thinking about treatment, will make them sick.
Good luck.