As a student, one is likely to hear over and over again about the nursing shortage and to see lots of big ads in nursing publications for new grads. No one said it might take several months to land a job and to be prepared for a stretch of unemployment after graduation. So it can be a bit of a surprise when getting hired is difficult.
Persistence is necessary in some hospitals. Pick a unit you're interested in, meet the manager, and call back weekly to see if there openings. Get to know someone in HR. Call back weekly. Drop in and say 'hi' as you check the job board. If you've already got a job as an nursing assistant or unit clerk or the like, keep it. It can hold you over till you find that nursing job. Apply as a nursing assistant or unit clerk. Or volunteer somewhere if you can.
Give yourself a job searching goals you can meet. You can't control whether or not you are hired, but you can plan to send out a certain number of applications a week, to contact a nurse manager or HR rep, to talk to fellow students (how their job search
or new job is going), etc. If your persistance is met with rudeness and you haven't been overbearing, then you've learned something. Use the time to find out about the different facilities. Take a tour of the places. Do the nurses look harried? Go to job fairs and open houses. Even if you don't get a job, you will learn something... and maybe get a free gift.
It's possible that with more time and info, you'll realize that one place is much more appealing and you'll be more motivated to focus your attention there and glad you had the extra time to figure that out. Good luck!