Jim,
I agree with Cookey, 34lb in 2-3 weeks is way too much. Your body has to be strong enough to fight this thing. At this point tasting and enjoying food is a luxury you no longer have! Davids VHC may work, or you can also consider Benecal (via PEG) to get extra calories. If you go the oral route then you might find viscous lidocaine helpful.

.... you have to stay on top of this.
BTW do you have IMRT or Brachytherapy?

M