Although medical textbooks list hundreds of different illnesses, a bad case of flu is high on the list of those that make you feel the sickest. Those who have really had the “flu” (and I’m not talking about a bad cold, although a mild case of the flu is indistinguishable from a bad cold) will know exactly what I’m talking about. It seems that your every muscle aches; you feel so weak you can barely click the remote on your TV; your mind is so foggy that comic books are challenging; and your throat is raw from a cough that brings up no phlegm. Conventional medicine can offer some help: If you’re at a high risk for flu, vaccines can reduce your risk of getting flu during an epidemic; antiviral medications can help (somewhat) check the spread of the germ to other members of your family; antibiotics can help you deal with bacterial superinfection, if you develop one.