Phase or Terrible Two's???

What a week it has been with Austin. Yes my sweet lovable little boy has turned into a tantrum throwing child. It has slowly gotten worse. Saturday morning while at The Little Gym, he screamed and cried while throwing him self on the floor. He also has bit Parker 2 times in 2 days. Once on the tummy and the other on the arm both drew blood. Did I mention the constant fights he has with Parker over nothing. Who is this child??? Is this terrible twos?? I want my other child back because if this lasts any longer I may lose my mind!