Mary,
My husband just finished the chemo and radiation on Friday. He has a peg tube and like your husband he didn't want to eat very much. We had a pump and he hooked up at night to begin with but eventually that didn't work. He would vomit every time he tried to eat through the tube. He started going every day for Intravenous fluids and kytril (antinaseau medicine). He went through a period where he wasn't getting any nutrition at all. He wound up the in the hospital for four days to stop the vomiting. The smell of boost, ensure and everyother thing we tried would just make him vomit more. What finally worked for him was carnation instant breakfast. After he got out of the hospital we tried it through the peg tube, gravity fed (no more pump at night) and it worked. He now takes it several times a day and is actually putting weight back on. He always seemed the worse about 2 to 3 days after chemo. Even today (3 days after his last chemo and two days after the last radiation) he is nauseated but he is not vomiting and he is still able to take that carnation instant breakfast (mixed with milk).
Good luck to both of you, it doesn't get better. Take the word of one food police wife to another.
Lots of Hugs, Denise