My mate had Prostate cancer, he's had plenty of the "knoboscopy" as you put it (made me laugh) and says once you've had a few you get used to them and he doesn't even worry anymore.You must be a real wimp. I had a knoboscopy every 6 months after having my kidney removed. There was only one occasion out of about 8-10 that it was anything more than a bit uncomfortable. The thought of it is actually the worst part. Good luck to the OP that it isn't anything serious.