A few days ago I had a mild fever that led to a very restless night. I woke up covered in sweat, thinking that I had sweat out the fever. However, since then, I have had a headache every night, starting around 19:00, which slowly grows and becomes worse. Also, I wake up drenched in sweat. And now its happening during the day. I randomly feel extremely hot, and start to sweat, only to stop after a few minutes. Any ideas about whats going on?