Hi,
I think I would go see my GI just to be on the safe side. If you do have a stricture maybe they can do a balloon dialation during a colonoscopy - I have done this 3 times, helped a lot. It is important to stay on top of these things before you have a real emergency. If you stop passing gas or having bowel movements consistent with pain you can feel through to your back, you have a blockage.
Take care,
Julia