stomach cramps

It has been awhile since i posted.  I had gastric bypass 11-2009 and everything was going good until around january this year.  at any given meal my stomach would cramp shortly after i ate.  at first it only lasted for a few minutes to about a half of an hour.  This would happen every couple of weeks.  In march it got really bad.  It cramped so bad that i could barely walk.  no matter what i did nothing helped.  this lasted about an hour or so and would haooen every couple of days.  i went to see my surgeon and he belives that it is an internal hernia.  i went for the ct scan and should "swirling" .  today i went for an ultrasound for my gall bladder and it was fine.  shortly after i ate lunch today it hurt so bad that i was on the floor in tears.  my boss took me to the emergency room but by the time we got there i was feeling better.  I am scheduled for exploratory surgery on may 1st so he can look to see if it is an internal hernia.....has anyone had this problem before?????