well, this is my first time doing this so i'm not sure what's the right thing to do, so please forgive me for many mistakes i made or i will made.
anyway, i read a novel and there's something i really confuse on. it's here.

“Just give me the chance to decide whether or not I’m going to throw a fit over taking you to the hospital.”
He made a face of mock horror. “Please, not a fit!”

“If you don’t let me see your hand, a fit is guaranteed.”

i don't understand the word ' a fit ' here, nor ' throw a fit over '. so, can anyone help me, please?