Hiccups
"My husband normally never has the hiccups but on the night of day 3 after having bowel resection surgery from diverticulitis, he was no longer passing gas.  Instead he was belching, burping and hiccuping. He would hiccup for hours then stop for a bit and this just kept going on and on increasing the pain of the surgical site and getting no sleep. On the night of day 6,Thorazine was added to his IV and within 10 minutes the hiccups were gone and he was finally sleeping comfortably."