I would recommend you ask for a referral to have your son evaluated by a pediatric neuropsychologist and that, if possible, you find one who has some experience working with high IQ kids with disabilities. The sooner you have answers or at least indications as to the cause of the aggressive and inappropriate behaviors, the better you'll be able to help your son cope and adapt. And having him under the care of a medical professional can help you advocate for appropriate placement and accommodations at school.
Last year was a disaster for my son (not for the same issues you describe but for other behaviors that created problems with his teachers). There were continual visits to the principal, angry emails from teachers, etc., but now that there are appropriate accommodations in place as well as information provided to the teachers regarding his behaviors, it has been a much better year for the teachers and my son. They can recognize triggers, they can interpret behaviors as they apply to him and not the general public, and then act accordingly. It hasn't been perfect, and I've still had my share of phone calls, teacher visits, and calls from the principal, but it isn't almost daily.
