You have made the correct diagnosis, these are temper tantrums. These are very common in this age group. The most important thing to do is not to pay attention to him when he is performing. Make sure that he can't hurt himself where he is in the room and simply walk out. Only return when he has stopped performing. He will soon get the message. This is usually a passing phase. It is no use trying to reason with him and it certainly will not help if you tell him to stop while he is throwing himself around.
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