Absinthesia

A temporary state of mind in which one is numb to all their insecurities and/or anxieties that stop them from presenting their true selves to the world. Caused by either being drunk or in an atmosphere in which one thrives.

This is a word made and used by Zach Taylor of the band Badlake Hill in their song of the same name.

Atticus: "Last night's show was amazing, man, you went absolutely insane!"
Trent: "I know, I can't believe it, guess I was just in a state of absinthesia."