When I was a kid living with SPD, I hid and isolated myself and cried and had panic attacks, but my sister would be very aggressive and mean. She'd throw me down stairs, start fights with me, and when my parents refused to intervene, she'd smirk and stick her tongue out leaving me helpless. She's also 2 years older. Now that she's 24, and on mood stabilizers (diagnosed with bi-polar, but I'm not really sure if she is, I was diagnosed with it previously), she is much more passive. I am not suggesting you medicate your son, in my opinion it's a bad idea unless his well being is SERIOUSLY at risk and then I'd say you should rely on a professionals opinion. But, and again, just a suggestion, please I advise you to do your own extensive research, something like Ritalin MAY help. The best way I can describe how it works is if you multiply a negative number by another negative number you get a positive number, which is opposite. So if you take a stimulated mind and add a stimulating medication, you can get a calmer mind. But I'd advise you to discuss this with a TRUSTED professional first. I've taken Ritalin since I was 14 (8 years) and it helps me greatly!! But it may not be right for your son. Sorry this message isn't very clear about if it will help, but I can only really tell you that it has helped me.