Constant Light Headche past 2 weeks

Ok this is the story since the past June 1, 2012 I've had this constant light headache, what happened was that in May 31st, 2012 that day I had a horrible insomnia, not sure why and I couldn't sleep almost anything I probably slept 2-4 hours, next morning woke up like usual actually without feeling tired or anything, went to work and did the usual work, I work in an office environment/warehouse so most of the time im in front of a PC and part of the time I'm on the warehouse carrying boxes or loading or unloading trailers, anyways during the day I felt normal until the afternoon I began to feel really weak in the sense that my body felt was cut like those times that you're going to get sick and you feel really weak and just want to lay down that's how I felt that Friday afternoon, I got home my head was killing me and I just laid down and fell asleep, after waking up I had a fever so I took some Tylenol and the fever came down quick and the headache was stable, so I just spend the rest of the day in bed,

Next morning I wake up and I had a slight headache and I've been like that since that day until now, it sometimes goes and I feel almost 100% again, then I get a slight headache/drowsiness and I feel like im not 100% good? like if I was really tired all the time ??? hope this helps thanks for any advice