Wow, that sounds scary! Has your son been checked out by a doctor? Any underlying physical condition, maybe? Does something happen just before he has a meltdown that could be triggering it? Or does it build up over time and he suddenly explodes? I wish I could help. I don't have any children or know much about them... I hope others respond to your question. I can see how having such an unpredictable and sometimes violent child is frightening and severely distressing.