My almost 4 yr old has become a terror. Throwing a temper tantrum at every little thing, hitting me but not his dad, whining and crying. Yesterday his teachers told me that lately he has started hitting his friends at the end of the day (one time with a shovel). He only does this at school with certain teachers in charge though. Any punishment I attempt sends him into a frenzy which causes him to come after me screaming calling me names and hitting and kicking me. Not sure what to do about this? Thanks in advance!