Bears repeating.
Actually, you sleep through the whole procedure, and even after you wake up, you don't remember very much.
Also, please keep in mind, should the diagnosis be bad, that radiation treatment and chemotherapy are much, much better than they were twenty, or even ten, years ago. Much better.
Once you reach "that certain age", or if you have a family history of colon cancer, GO GET THE COLONOSCOPY. You won't regret it.
It should be noted that everyone handles it differently. I lost my mother to lung cancer 2 1/2 years ago. She made it through the radiation just fine, able to function and go places, but the first round of chemo about killed her. She passed out and they had to revive her and she wound up hospitalized after wards. She never did recover from that.
OK - what is “that certain age”? About to turn 45 and don’t want to miss out on the excitement.