If you want to get a diagnosis, make sure you choose a psychologist that uses childhood history evaluations. One that diagnoses through observation alone will usually screw up when it comes to diagnosing adults. Some might also employ something similar to the 'Aspie quizzes' that you find online.
I find it to be rather telling that the Mayo clinic link keeps on mentioning 'Your child, your child, your child' as if adults with AS don't exist, when they're supposed to be one of the leading authorities on medicine. That should let you know just how few doctors are willing to look twice at an adult who thinks they have AS.