Five year old has become very angry/hostile after starting Kindergarten. What can be done?

My five year old has flipped his switch since starting public school. He's having issue after issue, and a part of me almost feels like it would be best to homeschool. Can anyone share any tips or recommendations? He just seems completely overwhelmed and flustered all of the time now! And on top of that, his behavior is TERRIBLE at home. 😞

It's his first school experience, so I'm assuming he will just have to adjust. But this has become very alarming for me because his behavior is like some I have never seen before!