how do I politely tell someone I want to hit their face with a brick over and over again?

It sounds like you're feeling really upset with this person. Instead of expressing those feelings in a violent way, it might be more constructive to communicate how you feel in a calm and respectful manner. You could say something like, "I'm feeling really frustrated and upset about our situation, and I need to talk about it." This way, you can address your feelings without resorting to aggression. If you're feeling overwhelmed, it might also help to take a step back and reflect on what specifically is bothering you.