A. You should definitely have his thyroid checked. Medical studies have shown that auto immune thyroiditis is a common cause of behavioral problems so he needs to have a complete thyroid panel run. I believe this condition is related to vaccines, much as vaccines are related to Attention Deficit Disorder in children. You can try flower essences, herbal formulas containing valerian and melatonin (3 mg. per day) but if this is thyroid-related, you need to address that or he will not improve.