I personally have never experienced this. Is it possible that the colon was distended (swollen from too much pressure of water/volume of gas) by either the colonic and/or insufflation? If so I don't know what one would do. If not, and if it's a blockage and/or healing crisis I would use Oxypowder or Homozon or use Milk of Magnesia to increase magnesium and peristaltic action in the colon.
Best of luck. That can't be much fun.