That sounds a lot like SPD but a few of the things in the mix sound a bit like an high functioning autism or asperger's type disorder too . The stereotype of a child with Autism who doesn't look at your face and doesn't care about other children is not always true, sometimes they are just a bit socially awkward or have trouble with boundaries and nonverbal communication. You could go about this one of two ways, the most through (but more difficult/expensive) way would be to look into local Children's Hospitals or other regional centers that could do a multidisciplinary evaluation for him, meaning a team of professionals would evaluate him to come up with a diagnosis. In his case you would need to make sure there was an OT on the team and a developmental pedi or maybe a psychologist along with some sort of educational specialist. You could also ask for just an OT referral from your pediatrician which would likely be helpful but may not give you the whole picture if there are other disabilities in the mix. Another option would be to do both because you are likely to be able to get the OT going a long time before you'd get in for a multidisciplinary evaluation. Most major cities have some sort of Autism Society with will have a list of resources either on a web site or if you call and ask - they should be happy to help you even if that's not your son's exact diagnosis.