i had the same problem after the first round of cisplatin.
my mo said it was caused by acid reflux caused by the chemo.
anyway he perscribed pantoprazol brand name protonix.
the pharmacist compared it to prevacid.
one a day took care of the hiccups for me

48 yo male smoker beer drinker biop dx 2/15/11 stg iv scc tongue
teeth out 2/16/11
peg 2/21/11
pet 2/22/11
total glossectomy 4/11/11
18 nodes removed. 1 cancerous margins clear