a sudden change in mood and behavior is certainly something to be concerned about in an 8 year old. If you child is having a hard time telling you what is going on, than I recommend you play it safe and take him to a professional as soon as you can. This could be so many things-- from bullying, to a mood disorder, to abuse that it is best to take it seriously. You do not want to take a chance that it could be something serious. I would call your pediatrician and ask for a check in (just to rule-out anything medical like a blood sugar or thyroid problem) and ask for a referral to a child psychologist. Hopefully this will turn out to be something easily addressed.
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