...advice? Get a part-time or volunteer job at a hospital to see if you really want to change your career. Being around the action will give you a better feel for what really goes on.
...obviously, get some career counseling at the local colleges that have nursing programs
. Some of your credits are usable: history, english, maybe some math, some electives. Ask to shadow a nurse or two. If possible, shadow on more than day shift and on more than one floor. If you are interested in a particular field, ie, OB, surgery, med/surg, ER,neuro, cardiac, dialysis, OR, request those floors...or a nursing home for care of the elderly. If you are interested in psych, I don't think you can shadow because of confidentiality.
...what is your profession now that you are thinking of changing? Anything related with healthcare? It is hard work to be a nurse, so be ready for your brain to go numb with so much studying. Good luck and let us know how it works out.