No one can stop you going to the loo if you need to surely? You're an adult and they have no control over what you do. If you need to go, then go :)
PS as Summerstorm mentioned, not eating = lots of gas so try and have a little bit of something in your tummy at all times :)
I have had an ileostomy for 33 years now due to UC.
Moderator of the Ostomy Forum
I'm not a complete idiot - some parts of me are missing!