It's been awhile since anyone posted to this thread, but I'm going to anyways.
I say trust your Dr. about as far as you can throw them.
Generally speaking, doctors are good intentioned, but that doesn't mean they can't hurt you too.
I would encourage everyone to ALWAYS research any medication a doctor wants to prescribe. Don't just assume they are all knowing and can't get it wrong or give you something that can have life-long consequences. In particular, pay attention to any pain medication and/or tranquilizer type medicines. These can, and in many cases will, cause terrible dependency issues later.
Lastly, if you feel you aren't getting the care you want/need - then get a second opinion. That's pretty standard and generally accepted by any doctor as a rational approach to your own care.