Spasms after colonoscopy

Hello,
Ive had a colonoscopy a week ago but I still feel my colon is having a lot of spasms. This manifests itself in loose stools, sometimes diahrea, lots of gas and mild pain. There is no blood in my stool and the pain is really mild.
I also have no fever.
My doctor said that a gut can be irritated for a few weeks after a colonoscopy and that the diahrea, gas and cramps will resolve by themselves.

I do have Irritable Bowel Syndrome, but it's usually not nearly as noticeable as what I'm feeling now. Is it possible that the colonoscopy permanently disrupted my colon? Or will it resolve?

PS: the colonoscopy showed nothing abnormal.