Nursing is an exception course which means even if you've had all the previous student loans you can get them again. Then there is. £5000 annual bursary for nursing plus and additional £1000 for mental health. Its worth seeing if you can find any other grants and bursaries from elsewhere- have a google and see what you find.
When I've looked into it I've found that although the total sounds a lot less than my annual salary, once you factor in all the stuff that comes out of your salary (tax, national insurance, pension etc) the take home pay isn't that much more. Plus you can always get yourself on the books for bank shifts for when you think you can fit it in.
Good luck!