Looking for a pediatrician specializing in diagnosing ADHD, Autism Spectrum, Sensory Processing Disorder, Hyperlexia, etc. Specifically need covered by GEHA (United Health Care) insurance. I have had NO luck calling Children's National, (after dozens of automated messages, I get sent back to the beginning). Earliest appointment I could find was for April. Any suggestions? I'm in the Arlington School district, Pentagon City. Thanks!