Fibromyalgia is a condition of widespread pain and fatigue with so many symptoms and little clinical evidence.
This makes it a difficult condition to diagnose.
Your doctor cannot detect it from a blood test nor can they see it in an x-ray.
You need to have widespread pain in all 4 quadrants of the body for 3 months or more to get a diagnosis.
When you have a diagnosis there are some treatments you can try but it is a matter of trial and error to see what works for you as at this stage there is no known cure only things that help reduce the symptoms.
If you have a diagnosis of Fibromyalgia you will find the articles here, each week, very useful in helping with different issues such as if you are still working and learning how others feel about situations that arise such as having to slow down.