Re: Wondering why I didn't get hired...
Wow..I am so sorry. Usually when folks have a post such as yours you can pick up 'something' in the post that might give a clue...but with yours? You sound intelligent, articulate, etc.
I would be as disturbed as you are. The only suggestion that I have is go to the Director of your Nursing school (set up an appointment with her), and ask her to be brutally honest...and tell her what happened. She probably knows you the best. Tell her everything and see if she has any suggestions.
If that doesn't work, contact your career counselor at your school and set up a "mock" interview. See if there is anything in your body language, something you might not be totally unaware of, take a copy of your resume, etc.
Grads that work as hard as you, should at least be given a chance.
Again, I am so sorry.