I need major advice here...?

Ok so in a nutshell I don't get along with my mother whom I live with, and I haven't seen my dad in 2 years because we kicked him out due to his drinking problem. My mom is addicted to facebook and is on the computer almost 24/7. She always gets mad at the smallest things that me and my sister do (we're 21 and 23) and its a constant battle between me and her. Tonight she claimed that we're ruining her life and she just wants to get out of here (shes been saying that for awhile) and when i tried to talk to her she screamed at me and threw her remote at the door i was standing behind. I want to move out so bad but im in university and dont know how well that will work...but my sister i know would probabaly be on board with me, I have animals and i will not leave without them. There are days when my mom is happy and not angry or on edge, where we go grocery shopping together or small things like that...but then there are more and more of those days where I feel like i dont even know her anymore, she talks to random people on facebook, and i have no idea about what, and is addicted to the games. Like it has interferred with all of our lives; getting her crops off is more important to her than listening to how my day went, etc. And when the internet stops working for some reason im always to blame, everything that bad happens i'm accused. My story has so much more to it, but I just need somebody to say something...i don;t really get to talk about how bad this has been for me to anybody. I just want to know how to handle this...should i get the heck out of here already? How hard would it be to live on our own and go to school