Ignore your "friends" and go get him tested. If he is on the Autism spectrum, early intervention is incredibly important. Without it, his temper tantrums will continue, and probably get worse. You think a temper tantrum is bad now? Wait until he's 8 hears old and weighs over 50lbs! Find a well-respected neuropsychologist or developmental pediatrician and get on the waiting list (it can easily take 9-12 months to get in to be evaluated.)

~amy