My 2e DS6.5-yr-old was tested with the WPPSI (Weschler) last summer when he 5. Neuropsych gave us a diagnosis of ADHD, Asperger's and anxiety disorder. She also couldn't say whether DS was gifted because the scores were inconsistent and scattered. However, DS had been in a private gifted school where he went through pre-k/k/1st grade in 2 1/2 months and we were told that he was possibly pg/eg. So we knew he didn't cooperate with the test or tester and that there was something going on.
In June/July, we saw a 2e expert and she dismissed the Asperger's diagnosis. Since August, my DS has been in neurofeedback (based on discussions with the 2e expert) - and I've found ADHD, and anxiety disorder were misdiagnoses too! And, yes, neurofeedback can cost $$$ - but it's been well worth sorting out the misdiagnoses.
In our case, it's pretty definitive from neurofeedback that my son never had ADHD, but since clinical psychologists are basing diagnoses off paper-pen tests, child's prior history, and observing a child's behavior rather than actual brain wave activity - then it's perhaps not surprising my son was misdiagnosed. I'm now in a position of actually informing the 2e expert on her misdiagnosis of ADHD since my son never had ADHD based on his actual brain waves which I've seen from his neurofeedback sessions!
I wish we had a taken a more direct route on treating my son or could give you an answer to help you. I can't say whether your son is misdiagnosed or not, but I can say that I knew as a parent that my son was being misdiagnosed and I stuck to my gut instincts and pursued any avenue possible. I'd also suggest reading as much as you possibly can and trying to form your own opinion, theory on what's going on with your son - even though others may dispute this method; It worked for me.
As a parent, you are legally entitled to testing through the public school system every two years, I think. I got my son tested that way and luckily it was the Woodcock Johnson test. You have to put such a request in writing, but it's something to bear in mind and remember what your legal rights are.
