I'm no expert, but it sounds consistent with the kind of "postviral" syndrome (also known as ME or CFS) you can get when your immune system has had to fight something, and it just does not give up when that something is gone. This typically results in a whole host of symptoms, including insomnia, light sensitivity, exhaustion,etc. You can compare your experience with another person's here: http://www.medhelp.org/forums/neuro/messages/30924.html