I had to take a year out of a course several years ago (not nursing but another related profession) because of my mental health. At the time I had no support outside the department and had no choice but to go along with it.
My advice would be to make an appointment with someone in student services. So the disability officer/mental health adviser or whoever your university has. The student union should also have someone you can talk to independently.
It might not make a difference, but they will be able to help you to work out the way forward. They will also know about any appeal process/alternatives you could suggest such as making up your hours in summer, or even at the end of your course.
This probably won't help, but I ended up not finishing my course (not by choice) and now I'm doing an even better one. Qualifying a year later won't be as bad as you think. Find things to fill the year, do voluntary work. It'll go quicker than you think.