Im not really good at putting things into words so please bare with me

I suffer from sever anxiety and one of my biggest triggers is shouting (my entire family knows this) Basically my mum, brother and I have been searching for houses all day because we’re being kicked out of our house so we’re needing to find one quickly, however I’m extremely picky and I don’t like any of them- the thing here being that every house we’ve ever lived in I’ve not liked in the beginning and it’s grown on me. Anyway we went out for dinner and my mum was asking is how we liked them and I said I didn’t so she starts shouting at me, saying I’m making her life difficult, that I’m ungrateful and should be more like my brother. She was not shouting loud however she was shouting and it really made me notice how my heart was beating and getting very anxious and shaky. Next we’re taking my brother to the doctors because he has the flu and I misheard something he said so I tried to correct what my mother replied, to which she started shouting because I MISHEARD him, not because I was trying to cause trouble but because I simply misheard him and she said I was stupid which made me get even worse and I started crying but silently because I’m a quiet one. Finally we’re in the car on the way home and she makes a joke that I don’t laugh at because quite frankly it wasn’t funny and was quite harsh then she started saying she kind of agrees with some guys intentions to cause a terrorist attack but didn’t really specify that she thought the attack was wrong but because I didn’t look at her and laugh she starts properly shouting at me as loud as she possibly could and despite the fact I asked her to not shout at me anymore she did it. Telling me that I’m ungrateful because everything she had done that day had been for me and my brother and that I was being rude and sarcastic for trying to defend myself during this panic attack I was having I was honestly sobbing and I’m sat here crying and shaking and I don’t really know what to do I don’t know how to calm down it’s never been this bad before does anyone have any advice because I’m really panicking I’m genuinely scared of my mum at this point in time please does anyone have any advice