What year of nursing are you in?
It does sound like you jumped into nursing without considering the other possibilities in the allied health professions. A lot of people tend to think in terms of the triad of nursing, pharmacology and medicine and not much beyond. It may be that another one of those would be more suitable. However, I do think it's important that you don't jump into something else without thinking things through.
You've got two options as far as I can see. Finish what you started and plan from there or terminate what you started and take some time to consider something new.
I know someone on my SLT course who exited her pharmacy course after three years and she had similar reasons to you. However, she actually approached her department for advice on her exit route and used her position in a clinical environment to try out a few different things. The university gave her a lot of help.
I think that's something you need to talk to your academic advisor about. Don't think this is something you have to conceal from the department. They want to find the best outcome for you as well. Just start with letting them know that you're concerned that you're unhappy with things at the moment. Remember, being unhappy at any given moment is something that's very common in healthcare students. They have a lot of experience in helping people work through periods of difficulty. Start there.