Reddit reviews A Casebook of Medical Ethics

Came here to say Oliver Sacks (neuroscience).
I picked up a used copy of the DSM-IV casebook; it's very cheap since the DSM-V has come out. Diagnoses may be outdated but the stories are still there!

There are casebooks in other fields, too-- Surgery, multiple specialities, medical ethics, [pediatrics] (http://www.amazon.com/Files-Pediatrics-Fourth-Edition-LANGE/dp/0071766987/ref=pd_rhf_se_s_cp_9_EQ6W?ie=UTF8&refRID=1WJ16SB6971PCJ94TK2S). Your college library ought to have new-ish ones you can read for free.

I'm also encouraged by reading scientific journal articles in medical fields (research is exciting).

Other stuff: The Immortal Life of Henrietta Lacks isn't about a doctor, but it's about a patient and the HeLa cell line that's been so important to medicine. My decision to go into medicine was affected by The Plague, a novel by Albert Camus about a plague-stricken city. (Main character is a doctor, though not exactly a modern MD.)