No digestion after colostomy

My husband had rectal cancer 5 years ago and the radiation made
a mess of his tissue.
   After suffering an infection, he had colostomy surgery 10 days ago and now has a
colostomy bag for the rest of his life.
   His colostomy seems to be working fine, but he is unable to keep
down any food.  He vomits it all many hours, if not a day, after eating, and
the food seems to be completely undigested.  Doctor has put him on metoclopramide
10 mg twice a day which doesn't seem to be helping.  This is the 10th day after surgery
and he is eating practically nothing and has lost a lot of weight.  Doctor wants to
know if he vomits because doctor doesn't want him vomiting.
  Can anyone shed some light on what's going on and what should be done? We're getting
worried.

[patient915]

Welcome to the gastroenterology community!  I think his reglan dose needs to be increased.  He can try taking it 4 times a day and see if that helps.  He might have gastroparesis which is slow emptying of the stomach.  If the reglan doesn't work, then he might need to have a feeding tube placed (an NJ tube).