Does your pain feel like gas pains? When they do a colonoscopy, the doctor uses air to "inflate" the colon to get better visualization and aid navigation. Then after the scope, the nurse should have told you to try to pass gas and continue doing so there in recovery. It is possible that you still have gas trapped causing your discomfort.
What have you eaten since the scope? Did the doctor advise you regarding diet and give you any limitations? I was advised to eat a bland diet for the remainder of the day and did not follow the recommendation and luckily never had any trouble.
They should have given you a discharge instruction sheet. Did you get one? Does it say what symptoms to look for that need to be brought to the doctor's attention? When in doubt, call them up!
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CD, Ankylosing Spondylitis, peripheral neuropathy, Sjogren's Syndrome ?