My mom verbally abuses me, and i feel the need to cut myself? PLEASE help?

My mom always calls me names like "B*tch, dissapointment, rude, useless, lazy. etc" I really cant go further, One second she's so nice, and the next she will start calling names, getting rude, bossy, and it really hurts me. The one thing i have gone to let out my feelings is to a blade. Im seriously about to start cutting myself, I know that sounds emo but i swear im not. I just dont have anyone to go to anymore. I really wish my mom would understand what shes doing to me. She makes me cry almost every day. And i cant go to her and tell her how this hurts me because then she'll just tell me im overreactive and i always try and do this to her and she will say "Is it that time of the month for you again?" Im really depressed. She is making my life so terrible now. Im not sure what i should do. Like today, I went to ask her where my nail clippers were and she went, "I GAVE THEM TO YOU!" I said "No, i never remember thatt" and she just gave me a dirty look and said "JUST STOP, OK STOP. GO AWAY. JUST LEAVE ME ALONE" So i left to go downstairs and she followed me and said "CAN YOU STOP OBBSESSING AND LEAVE ME ALONE." I was like "????" And she walked into the garage to get something and right before she walked in she said some thing like "GO TO BED" or something, It was only like 10:00 on a friday night and i said "Whatt??" Because i could barely hear her. and she walked in grabbed me by the arm, squeezed my arm really really tight and said "IF YOU EVER TALK TO ME LIKE THAT AGAIN IM GOING TO SLAP YOU ACROSS THE MOUTH YOU HEAR ME?!!?!?!?!?!?!?!?" I said "Uhh okkk??" Trembling in fear... And then right when i went to go walk away she shoved me really hard, i was stumbling foward because it was caught off gaurd.. And so later i went up stairs and asked if i could have a nail file, she grabbed a xanax out of her purse and said "SWOLLOW THIS." I was just like wtf? no. And she grabbed a water bottle and FORCED me to swallow it. then after i swallowed it she checked my mouth to see if it was swallowed. I seriously cant stand this anymore. Can anyone do anything to help??? (BTW the xanax's are mine. they were prescribed to me months ago, i just never took them because i never needed them) And she said right before i walked into my room " I SUGGEST YOU DONT COME OUT OF YOUR ROOM OR IM GONNA START SWINGING," As in punching me. Im scared now. I really dont kno what to do. And advice?