I was diagnosed with CFS about one year ago after seeing multiple specialists for a chronic low grade fever. After all tests were negative, I was given a CFS diagnosis after researching the illness and speaking to my doctor about it. I have many of the other symptoms and was diagnosed with fibromyalgia in 2009. I recently increased my exercise intensity too rapidly and was rewarded with fevers for over a week and the inability to function. Sitting up in bed to use a laptop is too hard so I'm pecking this out on a Kindle. Does anyone else have intermittent chronic fevers with that flu like feeling? Do you know the mechanism behind it? I've had the fevers about 75% of the time for the past three years.