I’m really stressed and need advice quickly

Assalamu alaikum, I’m in a tough situation and I need some guidance. My father was trying to help me get medical volunteering experience, but he kept insisting that inviting a doctor to my school just one time counts as proper volunteering. For the past year, I’ve been telling him it doesn’t count-my brother, who is a doctor, and my career advisor both agree with me-but he wouldn’t let it go. This whole year has been full of arguments because I feel like he hears me but never actually listens. He’s told me before that I ‘talk too much’ and ‘like other women, take a long time to get to the point.’ The only reason I go on is because he doesn’t listen the first time. Today, I reached my limit and started crying, so I messaged my brother. I know it was wrong, but I said, ‘Dad is really annoying me’ because he never listens to his own daughter. I know it’s not good to speak like that, especially behind someone’s back, but he saw the message. He threw my laptop, grounded me for the rest of summer, shouted at me outside where neighbors could hear, and when I raised my arm to protect my face, he hit my arm instead and threatened to knock my teeth out. He’s not a native English speaker and didn’t know what ‘annoying’ in that tone meant. He left the room and asked an AI what it meant, and it told him it’s a rude way of saying ‘very irritated’ but not as bad as swearing with profanity. Instead of calming down, he got angrier and said he was only trying to help, and that if I get that upset over this, he can’t trust me not to ruin his reputation if he makes a bigger mistake. I don’t even know what to ask. I just feel awful, like Allah might be upset with me and think I deserved to be hit. I’ve been really stressed and feeling unwell lately even before this. This morning, a lot of my hair fell out-eyelashes and eyebrows too-and now I feel like I can’t breathe. My throat keeps tightening, and I’m not sure if I’m going to be sick. Please, if anyone can reply here, I would really appreciate it. I prefer not to get private messages, especially from brothers, as I’m not comfortable with one-on-one chats. JazakAllah khair.