Totally been there. I was having panic attacks the last semester of school. What saved me? I went to my doctor and told her how stressed out I was and that I was panicking. She gave me the standard treatment: benzodiazepine for acute issues, and an SSRI for the long-term control of anxiety. It worked like a dream, and I was off them all about a year later.
Once you de-escalate, you’ll realize how high strung you actually were, and then you can put other coping mechanisms into place like meditation, exercise, etc. Realize that the anxiety means you really, really care. This is good. You are right to be fearful. Nursing is a very, very difficult way to earn a living. School will not prepare you for what you will get into. But, that doesn’t mean you can’t handle it. You just have to work really, really hard to take super care of yourself emotionally and spiritually.
Best of luck in your new career, and peace be with you! 😀