I also can't help but think the Xanax had a role to play this. Rebound anxiety --> palpitations, inability to sleep --> anxious distress -->.... I don't know why Xanax is the go to medications for PMDs. Why not try Klonopin first?
This is an important point in malpractice cases: Failure to follow "standard of care" (and I am assuming that simply for the sake of argument) in one aspect of patient care is often imputed to other aspects of patient care. That isn't the way the law is supposed to work; that isn't the way logic is supposed to work, but that is often an argument that a jury will buy.