I'm trying to remember the title/author of a short story I read about 5-10 years ago; I think it was new at the time.
It's about a teenage girl who lost her personality because of overdosing on some drug, written from the perspective of her new personality after the event. She can access her old memories but feels like they belong to someone else. Her parents want to restore her old personality and send her to a doctor/psychologist who turns out to be a quack (perhaps there were a series of other doctors before that but her parents keep switching until they find one who says s/he can help?).
There's a metaphor about a messenger not being able to find the queen so he gives the message to a servant instead (referring to how the new personality took over from the old one). I remember reading it twice, so it was probably reprinted in a 'best of [year]' anthology or perhaps nominated for some award and posted online.