My brother ate all of my food and I can't stop thinking about it.
I'm sorry he did that. Why are you thinking about it so much?
I'm going to get revenge on him for eating a lot of my food.
It is understandable that you are angry when your brother eats your food. He should apologize to you, there is no need for you to take revenge on him.
I'm going to make him pay even if it means hurting him.
Hurting him how? I think it's going too far. You should move on or ask for an apology instead.