And yes at the end of treatment I would sometimes get very very nauseous and couldn't keep anything down for almost a full day... it was the spastic projective vomiting too. My oncologist would occasionally give me fluids and this really helped. I also did accupuncture which helped me a lot.

I know it is so frustrating and scary too. I understand being scared that the feedings will make you sick. I had the same problem. Try smaller more frequent tube feedings where he won't feel so full and maybe that will help.