What do I do?

What do I do? My brother slapped me and I asked DID YOU JUST SLAP ME?! And he replied yes. He left my room and I just started crying… he also called me a brat when I told him to turn on the thing in the bathroom so my room wouldn’t smell so bad. I kind of want to get rid of emotions for him and just not care because of how useless I feel after he does something.. I just sit in my room crying