i can’t act normal and i don’t know what to do(advice PLEASE)

i physically can’t stand my mom. every time she opens her mouth i get really annoyed or upset. it makes me feel really really uncomfortable and i want to hit myself and throw things and scream and cover/plug my ears but i can still hear so i press harder even after it starts to really hurt. i almost wrecked her car while driving because she screamed until i started dissociating and i couldn’t tell my right from left or how fast the car was going or what my body was doing. this suddenly being annoyed thing is new, it started happening within the past few months. idk why it started happening but it’s really hard to pretend i’m fine around her and if i don’t pretend i’m fine she’ll start hitting me or start telling me i’m a terrible person and ruined her life that i deserve to be beat until i can’t stand. i just want to get away from her. b