Her symptoms: shortness of breath and a "wired but tired" feeling. First she was told she had asthma and, later, an anxiety disorder. This show guest thought she had a mental illness for 8 long years before receiving the proper diagnosis: mitral valve prolapse. Learn more about this heart condition.

Sponsored by Medtronic - for more information click here. Animation produced by Visible Productions Inc.

Dr. Oz answers a viewer question and explains how your body processes caffeine from drinks like coffee.