I don’t want to call the police on my sister if I can avoid that
It's gone way past that point now. This wasn't a gentle slap (not that even that would have been acceptable) – it's a violent assault which has left you with physical injuries.
Even if you said the nastiest things in the world to her, violent assault is not an acceptable or reasonable response.
My ex did this exact thing to me. You need to be no contact with him. Use your lawyers to communicate. This can escalate. Mine did. If you have evidence of him threatening you, try and get a protective order.
I don’t want to call the police on my sister if I can avoid that
It's gone way past that point now. This wasn't a gentle slap (not that even that would have been acceptable) – it's a violent assault which has left you with physical injuries.
Even if you said the nastiest things in the world to her, violent assault is not an acceptable or reasonable response.
My ex did this exact thing to me. You need to be no contact with him. Use your lawyers to communicate. This can escalate. Mine did. If you have evidence of him threatening you, try and get a protective order.
it might be because of what she eats