Just 2-3 sodas? That's nothing. I drink 2-3 pots of coffee or more a week. Most Americans live off coffee to some extent which has a hell of a lot more caffeine than sodas.

That doctor sounds like most doctors in any mental health related field; overly educated idiots who think they know everything because they have a fancy college degree and can read a bunch of books, yet fail to realize that they need common sense and critical thinking skills to actually utilize said knowledge. Doctors like him are just insecure little jerk wads who want to abuse their "power" to make themselves feel less insignificant than they really are.

Don't let it bother you. Just fire his dumb *** and get another.