I bed share with my LO. My pediatrician doesn't even know. I personally don't see how it's any of a pediatrician's business to tell you how or where your baby should sleep (except to tell parents what risks there are and what is recommended. They need to be unbiased).
If I were you, I'd go to a new pediatrician. I know that I'd get a scolding from the pediatrician we see if mine knew (and for that and other reasons we are going to try to find a new one). I think what she recommended as "sleeping advice" is ridiculous and is basically CIO, which isn't okay with a baby less than 4 months old (babies less than 4 months are crying because they need something).
If it makes you feel any better, my LO has started napping without me holding him. I think we're really close to getting him to sleep all the time on his own (which will help me get more sleep; we only have a full size bed).