I've had a few Colonoscopies through the VA except for one that was contracted out to a nearby doctor contracted through the VA. I had the same problem with painful farting with that fellow. It was explained to me that if they get in a hurry by pumping to much air into you that is what causes that. The doctor for you and me didn't take the time and got in a hurry in doing yours and minds operation, he probably wanted to get the job done so he jump back into his expensive sports car and get back on the golf course.
I didn’t mind the farting, the guy in the bed next to mine on the other side of the curtain was farting too...........LOL!