Hi Isitovercomeover and welcome to the board.
I am sorry that you are going through such a tough time, but I also think that it is wise of you to take stock of your situation and I admire you for reaching out to others as it isn't easy to do so.
What I would like to suggest is that you see with your school counsellor in regards to your grades and your major. The counsellor might have some advice on how to you can better your grades, or help you figure out if you are on the right path or if there is another career within the medical profession that would be best suited for you. My friend's daughter was also on track for becoming a nurse, and she was also struggling with her schooling. It was only after she changed majors that she really switched on, enjoyed school and excelled at it. She graduated pretty quickly once she switched majors, and she is now a forensic technician.
If your school has a health center, it would also be good to see a counsellor there who can help you with the emotional struggles that you are going through post-break up and in regards to school and your financial situation. It really does help to talk to people around us, and it's important to also talk to people who have trained to help us in addition to sympathetic family and friends.
I hope that this helps. I apologize that it's taken me some days to get back to you, but it's been hectic here lately.
Good luck, and let us know how you are doing!