Guila,
A PEG is inserted through a little hole that is punched in your stomach...it has nothing to do with the airway passage. At your dad's stage I was totally dependent on my PEG for nutrition and hydration. Also, please note that the first few weeks post-radiation are the hardest part of the entire treatment and recovery. Many people feel very bad and get depressed.

I suggest discussing a PEG with the doctor.

Best of luck,
Danny G.