So stressed

I have never been so upset with my mom until now. So she lives with me and all I ask of her is to help with the light bill which she complains about that and now she has her boyfriend coming to stay here for a month so they say but I have reached my limits. I'm so upset and want to flip out but out of respect I have to keep calm and all I can do is cry. I'm pissed. What should I do?