me and my mom got into a physical fight i

I was on a chat site 2 weeks ago and fell asleep. My mom found it and got really mad she gave my phone back after 3 days. Im not allowed to have it in my room. Night before last i had it in my room and i forgot. I said i forgot the password but i knew it but didn't want to tell her. I told her I'm not doing anything bad on my phone. Next morning she went to get her car. She came back and got really mad bc i woke her up when i went in her room to get a comb because my head was itchy. She thought i was trying to get my phone. I walked in to put it back. My brother woke up to tell my mom his stomach hurt but her bf was in there so he didn't. 5 minutes later he went poop and wanted me to tell her so i did, she got mad because i woke her. She had to work at noon it was 8:30 She threw pillows and shoes at me and my phone she told me open it. I said i can't smached it with a hammer. Threw it at me again. She hit my chest told me go take a bath im not staying here by myself . I did i grabbed my Bible put it on my dresser i was crying at this point. She came in and said oh your crying huh ill give u something to cry about. She took it and threw it at me. Then hit me in my chest with an open hand 5 times i went to take a quick bath she watched and when i was done threw a power bottle at me. Later she told me get out of her house i went to get wool socks and a sweater. And an extra pair of socks. I grabbed my Bible and a book for fun. I told her i dont want to leave this went on for 30 minutes. I went to get the bag of pills so i can be ok when i leave. She thought i was going to overdose started crying hit my chest again put her arm around my neck choked me shoved my to the floor. Put my arms above my head started punching my face. 20 minutes later she called family to come get me. She tried finding a foster care number or psychiatric hospitals number. Today im quivering non stop and since last night at 7:00 pm. My face is sore. I'm not eating anything. She is acting like nothing happened. My breathing won't stay at one pace. I can't think properly. I cut my arm 8 times with sharp plastic. I'm not sure what to do. I dont want to be by her i feel like she's going to hurt me again. Please help me. Can someone tell me what i need to do