Rather than rehash, thought I'd offer this thread if you haven't come across it...some discussion of anxiety, depression, adhd, aspergers and how it can all be very confusing.

The suggested neuropsychological eval (from keet's post) is the way to go if at all possible, as it looks at the whole child, environment, etc. rather than just one issue and try to fit it to the child's behavior

http://giftedissues.davidsongifted..../47294/Depression_or_ADHD.html#Post47294

https://twitter.com/asimom, https://contributingfactor.wordpress.com