Kurt Vile has a great song about that sensation, "Pretty Pimping".
https://genius.com/Kurt-vile-pretty-pimpin-lyrics
> Didn't recognize myself in the mirror ... I proceeded to brush some stranger's teeth
https://genius.com/Kurt-vile-pretty-pimpin-lyrics
> Didn't recognize myself in the mirror ... I proceeded to brush some stranger's teeth
EDIT: Depersonalisation disorder - https://en.wikipedia.org/wiki/Depersonalization_disorder