Dear D.,
My own son has never received a formal diagnosis, but when he was a bit younger, he seemed clearly "different" enough that we had some run-ins with the whole social apparatus of diagnosis. So, I haven't been in your situation, but I've been close enough to have given the matter some thought.
Okay. First of all, I think it's important to be aware that the NOS in PDD NOS stands for "not otherwise specified." Honestly, I think the acronym should be IDK, for "I don't know." It refers to any child whose social or cognitive development is atypical but who doesn't fit into any predefined category or "box." You could put 100 people with NOS diagnoses in a room, and they'd all have completely different issues, and completely different gifts and talents too. There is really no "road map," and no stereotypical presentation, associated with this dx at all.
My own son, who turned 4 this summer, does not have enough ASD symptoms to warrant a diagnosis, but he does have some. It's like, if ASD is a "spectrum," or a yes-no question, he doesn't have it. But if ASD is a continuum, he's closer to the autistic side of the continuum than I am, or than many people are. He's basically extremely shy (though that's gotten a lot better in the past year), he's physically cautious and uncoordinated, he has some clear sensory integration issues (also improving), and he's super-smart, especially in the areas of math and science. He's a classic nerd and a rocket scientist (I mean, literally: some of his favorite topics of conversation are the solar system, jet propulsion, and "fire molecules.")
I wanted to introduce him at length to give you a sense of how far he's come, socially and sensorally, in the past 2 years. At 2.5, my son was literally terrified of water, sand, wind, and snow. Today, wind and sand are no problem *at all.* He still has some issues with water -- to the point where he's clearly not ready for swimming lessons -- but bathtime is no longer the nightmare it once was. And he has FRIENDS. Sounds like no big deal, but this is the kid I used to describe on FB as "The. Shyest. Child. Ever. In. The. World." I honestly didn't do anything to bring these changes about, save for some very successful "science experiments" involving simulated wind. N. just matured, and as he did so, he developed coping skills.
Our experiences with the whole diagnostic system have been pretty limited, but from what we have seen, there are people who get it, and who prescribe and practice appropriate therapies, and there are plenty of other people who flat-out get it wrong. (Not that they're bad people, or that they're wrong about everything, but no one is going to understand everyone.) The important thing is to trust your own experience and not let that be subsumed by an incorrect diagnosis or an inappropriate therapeutic approach. I really recommend a book called Raising Blaze by Debra Ginsberg. It's about a little boy who never did outgrow PDD NOS, but it's a fantastic "road map" for both working with "the system" and trusting your own observations, and never giving up.
Finally, while I think a lot of the therapies out there are terrific, it's important to remember that the science of dealing with ASD is in its infancy -- in a completely experimental stage. There's a wide range of diagnostic and therapeutic approaches out there, and there's no real consensus on any of them. I'm not advocating not doing therapy or intervention AT ALL, but I do think some of the interventions go too far. There are lots of kids (like, well mine) whose cognitive abilities far outstrip their social abilities, and there's a current in our society and educational system that wants to focus 100 percent on the social, at the exclusion of their scientific/mathematical/musical/etc. gifts. I personally think that's a huge mistake. Our kids may never be "people persons" but the world needs more than that. The world needs rocket scientists, brain surgeons, and, well, broom scholars too.
Best wishes, and sorry this was so long,
Mira