Does Anxiety Cause Episodes Of Eyes Rolling In Back Of Head And Shaking?

A teenager i know have been having episodes where her eyes roll in the back of her head seems like she quits breathing starts shaking all over and when she came to had complete memory loss. Took her to the er they said it was anxiety she got up this morning eat and talked to everyone still wasnt sure of who everyone was then had three more episodes back to back. what can cause this.