Hi, Kittkatt. I am just about 5 months out of treatment for tonsillar cancer. I had Cisplatin and radiation, and I'll second the opinion that Cisplatin is somekinda nasty stuff. Expect some moderate to severe nausea. Make sure the oncologist prescribes some anti nausea drugs for your nephew, he'll need them. Make sure he gets plenty of fluids, as Cisplatin needs to be eliminated from the body ASAP or he may have some kidney damage. Ringing in the ears is also a common side effect.
I'm sorry he has to deal with something like this so young, but hopefully, before too long he can have this behind him and get on with his life.
Best wishes for both of you,
Mike