What To Do? PLEASE HELP?

Ok, so me and my mom got in a fight about the food we have in are cupboards. Shes like no one has this food in their house. NO ONE. )Honestly its not that bad the most unhealthy stuff in there is like pop tarts, or pretzels) And then shes like And anyone who does has problems. So I'm like well look whos talking. (She was putting lays chips in a bowl and about to ea them) So she goes: You know what? I might as well just leave. Im so tired of this disrespect from everyone. And you wanna no what Ashley? (thats me) And she goes Im gonna leave and you won't have mother anymore. And im so upset..im crying and my chest hurts. Shes drunk. She gets this way like 3 times a week. i HATE it! Idk what to do cause i think when i come home tom. she'll be drunk too and be worse. What do i do?