That's a very common post-abdominal surgery complaint. I used to have that problem sometimes, but it will never happen again: I just slather a lot of mayo on a sandwich or eat a serving of pesto pasta, and I'm in the bathroom urgently within an hour.
I've got to go pick up my gallon of super-colon-blow from the pharmacy for my butt-viewing next week. Never met the doc who knows my colon so well, because he always comes in after the drugs take effect. Everything is non-malignant so far. The fun part is transparent poop!