Hey focker,
I 1st got a BS in Biology, then started and MPH program (hated it), then went to nursing school, and finally completed a post-bacc program. That's a long road, but hey, what ever works.
It goes by much faster than you think.
Just to throw in my 2 cents, since you already have your associates in nursing and have taken the NCLEX, I would then get a bachelors in something else like biology or biochemistry. These majors will help you with the heavy basic science of the 1st year of medical school. Your clinical experience as a nurse, and the clinical courses you took during nursing school will help a little come second year of med school.
This is just my opinion, but unless you are going to use nurse practitioner as a back up plan, I would would suggest you strengthen your sciences with a degree in Bio or Biochem.