for months and months and months, i vomited everytime i went to the toilet practically.
at least once a day anyway.
the pain from going to the loo was so bad it would make me puke. i had to have plastic bags in every bathroom for me to vomit in.
and sometimes it was lots of vomit, sometimes not so much. it always happened while on the can. i looked like a fountain as it was comin out both ends at once.
but i puked at least once a day when going to the toilet.
my doc said that it is not uncommon to vomit from acute bellly pain.