A Creepy Boss, Rubbery Eggs, and Exploding Heads

You've excused yourself to the bathroom during another gallagher at the bar. Your reflection is staring a little bit too hard at you from the mirror. You question if there's something actually there.

Are you possessed? Is this mental affliction demonic? Or does it just feel like it is? Our protagonist Laura hasn't a single clue and is powerless against it's influence

She doesn't realize it, but her world is falling apart. A novella not for the faint of heart.