You need a better endodontist. I've had several and have had no problems.
Well, the novocaine helps a bit, but it still feels as if they are pulling out pieces of brain. (That could explain my current state of goofiness.)
I have had root canals by 2 different dentists, and it has always been horrible! I have not been to an endodontist. Maybe they have better drugs. ;-)
Or, perhaps I am just a wimp.