I don't speak Aussie, so I'm not sure what an "enrolled" nurse is. Is that a student? But I know when I graduated from nursing school
, for a solid year or more I questioned myself, was very stressed, "why did I go into nursing" etc. I was seriously stressed.
First of all, it's not worth your health. You might consider seeing an MD for a thorough physical just to rule out an organic cause.
Before you abandon nursing altogether, make a list as to why you wanted to be a nurse, balanced with all the negatives you are feeling.
There are other things to do once you get some experience under your belt that might be easier on you.
In the meantime, do what it takes to take care of yourself physically, emotionally and spiritually.
Best of luck to you on your journey.