I think it's never a bad idea to get as much information as you feel you need to know about something in order to understand it. But there comes a point where you have to make a decision to either trust your professionals, get new ones or go your own way.
My psychiatrist says the DSM isn't worth the paper it's written on. I concur.
When I first got diagnosed about 3 years ago now, there was a huge list of things: BPD, dissociative disorder, depressive disorder, EDNOS, panic disorder w/agoraphobia and OCD, all with psychotic episodes. When I got my new psych, just a couple months ago, she said she was scrapping it all and changing it to PTSD and EDNOS. I felt kinda hollow when she said that. Here I'd been identifying with specific things for so long, and now it was different. Because it went from so many things to just two, I felt like somehow my experience was being invalidated.
Basically how I feel about it is, regardless of what some doctor has to say about it, or the DSM, or anyone else, it's your experience that matters. Regardless of what's going on for you, you still have to find a way to take care of yourself. I would use the information to that end, not to question or investigate professionals or drive yourself crazy over it. And if you really believe that your professionals do not have your best interests in heart, and they are not encouraging you to learn as much as you can (all of my doctors have done that), then perhaps you may want to find someone else.
Just my two cents.