Mood swings?

Some stuff at school has been happening at school, and i don't know what's going on.

Okay, so i'm in my class i have these mood swings (i think).
So i'm thinking about some bad stuff about things that's going on at home, like how my mom calls me fat*, or my brothers a **** I get mad. I meen really mad, and i just need to destroy stuff. I grab a piece of paper and start ripping it. i can't help myself. And if someone disturbs me, like say "robyn" or "robyn, are you okay", then in a snap i get sad and i start balling. Not crying but balling. So i run to the bathroom to avoid questions.
I'm just getting so emotional in class, i'm so confused.
PLZ HELP ME

*see "black corner" (one of my posts)

hi blackkitty, wow hun, i'm sorry your going thru so much. have you talked to your mom about how you've been feeling? perhaps a trip to the doctor? do you have the option of speaking to a counselor at school? could you be pregnant? could it be your menstral cycle? i'm sure grateful that your reaching out for help with your "mood swings" and hopefully you'll get to the bottom of things soon.