Recommend a second opinion with someone who's read Misdiagnosis and Dual Diagnoses of Gifted Children and Adults: ADHD, bipolar, OCD, Asperger's, depression, and other disorders by James T. Webb, Edward R. Amend, Nadia E. Webb, Jean Goerss, Paul Beljan, F. Richard Olenchak.

Here's an excerpt:
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Many gifted and talented children (and adults) are being mis-diagnosed by psychologists, psychiatrists, pediatricians, and other health care professionals. The most common mis-diagnoses are: Attention Deficit Hyperactivity Disorder (ADHD), Oppositional Defiant Disorder (OD), Obsessive Compulsive Disorder (OCD), and Mood Disorders such as Cyclothymic Disorder, Dysthymic Disorder, Depression, and Bi-Polar Disorder. These common mis-diagnoses stem from an ignorance among professionals about specific social and emotional characteristics of gifted children which are then mistakenly assumed by these professionals to be signs of pathology.

http://www.sengifted.org/articles_counseling/Webb_MisdiagnosisAndDualDiagnosisOfGiftedChildren.shtml