Hi Amber,
Since you already know what sort of Master's program you want, and it's a highly specialized one, I'd strongly urge you to contact those schools that offer it that may interest you and ask them for advice on a Bachelor's program that would make you a competitive applicant.
Any sort of medical program will probably want strong coursework in sciences like Biology and Chemistry. I'm not sure how easy that will be to find by distance.
-=Steve=-