Can you get alcohol poisoning without knowing it and get brain damage from not going to the hospital?

I drank a whole bottle of vodka one night alone at home and I blacked out and woke feeling sick with stomach pains and vomiting and horrible headaches. My sister said she found me in the morning next to a chair toppled over saying “The chair is awake” so I must’ve been hallucinating which is scary. I’m worried that I got brain damage from not getting enough oxygen especially from sleeping on my back and just from drinking so much alcohol in general. Can anyone reassure me?