My 5 Year Old Son's Behaviour Is Getting Worse. He

My 5 year old son's behaviour is getting worse. He can be happy and clam one minute then out of the blue he will become aggressive and start throwing things , yelling crying and is now hitting out at me. It takes him a while to settle depending on the situation. He goes to prep and every morning it is a drama to get him ready for school. He has no fear or throught for anyone , doesn't not care who hear or see his naughty out burst. Do not know what else to do, have even taken away toys, books, etc, even this does not work, when he is good he is loving and a very beautiful little boy. Help.