Not sure if it would work for fibromyalgia. I have nerve pain from RSD after many hand surgeries. (I also have fibromyalgia.) I did stellate ganglion blocks for the nerve pain and have had varying relief with them. Maybe it's something you could ask about. Best of luck.
I would think there would be another kind of med. My rheumatologist has me on Cymbalta to help with fibromyalgia pain,.