Hi there,
Is your son also acting out at school? and other places ? It is not just at home? I ask this important question because a child whois truesly having significant behaviral problems will exhibit them everywhere he goes, it will not be isolated to , say his family home, or school. If he is acting out just at home, than their lyes the problem. Family intervention is necessary. Family therapy , and ways to learn to deal with the child's behavior, giving him real consequences , to his behavior , nipping it in the bud as soon as it happens , 0 tolerance for the behavior , and so on . Will need to happen.
However, if the child is acting out everywhere he goes and is totally out of control , nothing is working to calm him down. He needs to be evaluated in depth. Although he already has diagnoses, something else needs to be done in order to deal with his behaviors. A behavior plan .
Are their any special schools that deal with children who have behavioral problems like your son's? Extra support , and modeling good behaviors is what your child needs.
He is still young, please try not to think the worst about him. In The States we have school programs for children with behavioral problems . Pershaps where you live their are some too?
Early intervention is vital.