Jack,
Sorry to hear Eric is having such a rough go of it. One thing my husband found to help with the nausea (from the amifostine as well as the chemo he was getting at the same time as radiation) was to use wrist accupressure points. Our accupucturist friend instructed him in the location of the points and he would apply pressure when he felt the nausea coming on. She also gave him "sea bands" that do kind of the same thing. He also found that sucking on (or sometimes just smelling) strong peppermint mints would help. I know these are just little things, but Eric might want to give them a try.
Trust that things will get better, even though it is hard to believe, at times. My husband is about 3 and a half months post radiation and chemo and he is actually starting to take short runs in the mornings now.
Anita