All men are created equal,
but all doctors are not
Not all doctors are created equal. I graduated in the top 1% of my class in medical school. Some of the tests were so hard that a passing score was about 45%, because our exams were graded on the curve (as is true in many medical schools). Many people who are now doctors (and possibly giving you advice) squeaked by with such low grades, while I was acing exam after exam and getting more than twice as many questions correct. So did I learn about twice what the bottom-tier doctors learned? No, the difference was even greater. An elementary school student could score about 20% on a multiple-choice test just by guessing, so it is clear that students with scores of 45 were benefited by a lot of guessing. It is impossible to get the 95+% scores that I achieved by guessing. I learned almost everything taught in medical school (and then some, because I did a lot of reading on my own), while some other doctors — perhaps even your doctor — may have really known only a third of what I did.
I mentioned this because your life may very well depend on the quality of the medical information that you receive. Please don’t assume that all doctors are equally qualified.