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...separation anxiety... Assessor thinks he has strong perfectionism that triggers anxiety and this is the reason for slow processing.
Perfectionism and separation anxiety have been the topic of recent posts, possibly some of those discussions may be of help?

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I am also looking to locate someone who understands gifted kids who can determine/rule out a LD.
Hoagies has lists of psychologists and professionals familiar with gifted children, and some do phone consults.

These youtube videos may also be of interest: SENG, Webb. This book is mentioned.