Is he crazy?

I believe Hamlet did not go crazy in the play, He was just Drossy about what to do in the situation he was put in by his Uncle (the King). I think he change throughout the play because at first he did not know what to do. Then later on when he meets Fortinbras he knew what he had to do. "we gain a little patch of ground That hath in it no profit but the name" (Captain 4.4.19-20) . He started to believe that he was able to do what he wanted, Revenge for his father Death and make it so when he dies, he dies in peace.