influenza
"Came home from college classes at 10:15 am  got out of my car and felt the chills coming.  Went upstairs to rest and figured that I'm sick.  Called my doc and scheduled an appointment.  He prescribed me Tamiflu and I thought, "Anything that makes this cruddy feeling go away is better than nothing."  Took one when I got home at 4pm  and one at 9pm.  Woke up the next morning feeling way better than the day before.  Fever went down, slight headache persisted.  Otherwise, a champion of a medicine!"