There are a number of so called Autistic spectrum disorders.
http://hcd2.bupa.co.u...eets/html/autism.html
It does sound though rather symptomatic of some of the disorders.
My son was diagnosed with ADHD - he wasn't particularly badly behaved as the popular stereotype but had lots of difficulties with concentration and writing. He was referred by the GP and went through a number of appointments and tests with a specialist prior to a diagnosis
Again don't believe these Daily Mail stories about everybody getting diagnosed in 30 seconds and shoved on Ritalin at a moment's notice.
I'd caution you though not to get too hopeful - once diagnosed there is not an awful lot in the way of treatment. Ritalin is helpful for a minority of cases almost all ADHD. It obviously means he can be statemented at school and qualify for extra help etc.
One final thought - any body else in the familly with symptoms - there does seem to be an inherited component to some of this