If you're getting an endoscopy, that changes things, because a specialist is going to be looking at it. By the way, nurses aren't specialists in anything. People are different -- most Americans love medication, and pharmaceutical companies love this, and they write the textbooks used to train doctors (the professors are virtually all in the pay of the pharmaceutical companies one way or the other, as are doctors, in the form of free samples, speaking fees, paid vacations, etc.