Wendy,25 pounds is not too bad, all things considered. Of course, I don't know where he started. I lost about 35 myself, but let's just say I had some spare poundage that I could bear to part with.
I did not have a big problem with Nausea, just a little from the Amifostine. But it should abate fairly quickly once the cocktail of drugs abates. I did not have acute burns, but my neck became a bit more tender over the week or 10 days following the end of treatment, then turned the other direction.
Glad he is almost finished! Thoughts are with you.