Posted 7/15/2013 2:11 AM (GMT 0)
Could be pouchitis. Could also be garden variety viral gastroenteritis (stomach bug). As my GI said when I got food poisoning with my ileo, "you're entitled to get sick just like the rest of us!"
In the meantime, drinking so much water could be causing you to have MORE BMs. Try sipping a rehydration drink like Pedialyte, or Gatorade diluted 1:1 with water.
Can you call your GI's or surgeon's office and speak to someone over the phone? They should be able to at least listen to your symptoms and tell you if you need to come in or if you can wait and see.