I am so sorry you are having such a crappy time. Hon, its time to look for a different job. In my exp, the Dr is actually over the manager, so maybe speak with him. Just be sure and DOCUMENT everything. Write it all down on your personal time, and if anyone emails you anything, forward it to a different email account that you have access to at home, I would also ask the manager to email you the change in schedule and ask why cant the three of you have alternating weeks of 10 hour shifts? that seems fair to me, and if she says no, go to the Dr. and document everything said!!!! Good luck.