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Well, if you are interested in nursing there are nursing programs designed for people who have a bachelors in another field. To get in, you'll need to have science pre-requisites like bio, chem, anatomy & physiology (plus more). Because you already have a bachelors you'd be taking just the courses in nursing to prepare you to sit for board exams. Depending on the program it may take 15-24 months to get a 2nd bachelors, not another 4 years.
There are so many careers in healthcare!
A great site would be http://www.bls.gov/home.htm where you can search by career and it will provide you information such as education requirements, salary, job outlook, etc.
I am very interested in dentistry. However, I don't have the credits that dentist school requires.