Blue lips is not an FMS/CFS symptom. This happens typically due to hypothermia or oxygen deprivation. It can also be caused by low iron or anemia. Of course, you could have several things going on at one time (FMS/CFS being one of them)..and yes, it can hurt that bad.
It would be difficult to say one of these illnesses are the probable cause without the lab work and further testing done to rule out other possible medical conditions. Wait until your labwork returns and you can discuss it more with your physician...as the tests may show something that can help ease these symptoms you are having.
Please keep in touch and I hope you feel better soon.
In my opinion, some of the symptoms like lips turning blue, one hand looking darker, and swelling of hands, does not sound typical of Fibromyalgia. These symptoms almost sound like a problem with circulation and the muscle cramps could be a problem with your electrolytes, but I am not a doctor, of course. I am hoping you will have a full medical work-up to rule-out other conditions.
Fibromyalgia is a cluster of symptoms, but involves pain and stiff muscles, sleep and hormone disburbances, GI disburbances, immune dysfunction, fatigue, cognitive dysfunction, etc.
I am sure that others will offer you their opinions and experiences with Fibro,, but usually a lot of other tests are done to rule-out other conditions before receiving a Fibro. diagnosis.
Warmest Regards