Another thing to consider is what is happening as school. Your son is going to a new school, with a new setting. This may be causing problems.
Another idea may be to give your son some time to be himself in a private place (such as his bedroom). I notice that helps alot with other children and even myself in controlling my meltdowns.
The goal for you (and your husband) is to find the trigger. Find that and you will stop the meltdowns.
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Louis J Bouchard
Rochester Minnesota
"Only when all those who surround you are different, do you truly belong."
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Fred Tate Little Man Tate