i would make it known to your company that you feel unsafe and they need to do something or you are going to leave. dont just leave. if things get real bad while you are at work do this. call the house supervisor and tell them you are very ill and threw up and need to go home. this way they cant yell abandonment when you leave. i would also suggest getting it in writting that you are leaving cause you are sick
the other thing you could do to leave abruptly with out too many ramifications tell them your brother died and need to leave and dont think you can finish your contract. be creative.
i am sure you will never be able to work for that hospital chain again. if it is a single or only a few hospitals then oh well if it is a very large chain then you cant work for them which will have future implcations.