ADHD / ADD Support Group
Attention deficit/hyperactivity disorder (ADHD) and attention deficit disorder (ADD) are more common than you might think. It is a syndrome that exhibits symptoms such as hyperactivity, forgetfulness, mood shifts, poor impulse control, and distractibility. Join others who suffer from these conditions and share your experiences.

There's a Youtube documentary called Child of Rage, portaying a severely abused six-year-old girl who keeps trying to kill her new adoptive family. It's so sad to see. But with the right program and mentor, she was able to become a normal, functioning adult later in life.
I'm not saying this 8-year-old is a killer but it seems antisocial children's brains are still developing and have hope for change if they get the right kind of help early enough.
Ideally you can find your son some new friends, challenging as that may be. Perhaps you could find him some adult friends who would be understanding. I have a lot of fun with my three-year'old nephew and he considers me a good friend :).
Best of luck to you both