Such aggressive behavior and inability to tolerate frustration can be symptomatic of more than one condition. For example, the characteristics can indicate a mood disorder, or they might indicate an impulse control disorder or a type of disruptive behavior disorder. It will be important to clarify the nature of your son's condition by having him evaluated by a pediatric mental health professional. While you are doing that, you will of course have to manage the behavior. A very practical and entirely reliable guide can be found in Lynn Clark's wonderful book about managing children's behavior. The book is titled SOS: Help for Parents. Take a look at it. Thousands of parents have derived great benefit from its wisdom.
p.s. He has read books that have been helpful to him.. "taking the grrr out of anger" seemed to be the best one. try it if you think it might be helpful. It made him more aware of how his behaviour was affecting others.
The reason for the anger is the constant anxiety children with SID deal with on a daily basis. Things that wouldn't bother the average person drives them crazy. The clock ticking, cool air of an air cond. blowing on them, different food textures, loud environments (the mall is a killer for my son) it is so sensory overloading for him he acts almost ADHD there. He also exhibits fears so extremte to him they sometimes cause panic attack type symptoms. For example...he's afraid of being in his bedroom by himself at night. He says he doesn't feel safe there. No, it's not a ploy to stay up late or anything like that. When he wakes up in the middle of the night he has a look of fear in his eyes when he comes in and wakes me up. Another symptom of the NLD is not recognizing tones of voice or when "enough is enough". These kids tend to annoy others because they don't understand NONverbal cues ie. facial expressions & like I mentioned-tone of voice. One of the reasons for him sounding so verbaly abusive is to him his own tone of voice sounds fine, normal, not negative one bit. Thank god he's not physically abusive, I mean we have the typical sibling spats but most of his anger is directly verbally or by him stomping around and slamming a door.
We're currently waiting to see a Psych. again and are starting some Cognative Behavior Therapy at home. I keep telling myself that it will get better as he gets older, either that or I'll start drinking... kidding!
a kid acting out with aggression, is getting picked on.
you're going to have to figure it out from there. And get professinal help.