I have fatigue and muscle aches, could it be Fibromyalgia?

Fatigue and muscle pain with normal test results

I have fatigue and muscle aches. I have had several blood test and all have come back normal. I was told it could be Fibromyalgia. I read about adrenal fatigue online and it fits my symptoms also, however, I have read some that say it is a real condition and some who say it is not. Is adrenal fatigue a real condition?