I left a corporate career to become a CNA. (Wanted to work in health care but after spending 11 years in college and graduate school did not want to pursue another degree.)
I recommend keeping your current job as long as possible while you complete the prereq's. Start living on a reduced income now, save the surplus or use it to pay down any outstanding debts. If you have already completed a B.A., there is not a lot of federal financial aid available. Some states have loan forgiveness programs if you work in a rural area after graduation.
Consider obtaining nurse's aide certification. It will allow you to earn some income while you are in school. If you work through agencies, you will have a higher hourly income and the ability to set your own schedule. Some nursing schools
like to see applicants with this type of experience.
The drop in pay really isn't that bad if you're doing something that makes you happy.