I agree with mlgable, see a doctor. You get one shot at life. Wouldn't it be a shame that yours would end early because you're afraid of something that they do every single day?
You're right, that procotscope is bad. If you were to need any further tests, they are much better as you are either put all the way to sleep or put so far under that you don't care.
Seriously, the tests are no fun for anyone. No one I know has yet to throw a "yay, im getting colonoscopy test" party
Please don't mess around until it could be too late. Good luck to you.