I can't imagine how you felt but I can certainly understand your anxiety. I was in a situation like that a few times too. I came to the realization that it is MY license on the line and I don't play around with people's lives. If you are not getting the support you need from your workplace, consider your options. I considered mine and went into case management. Now, I'm a manager and work from HOME. Now, I LOVE nursing whereas before I was going to quit and never go back.
Before I switched jobs, I couldn't sleep, I would cry before my shift, get into fights with my husband because I was so bitter, angry and anxious. It wasn't fair to myself, my kids or anyone else. It was the best decision I ever made. Perhaps a different unit would be good for you.