What does fibromyalgia feel like?

Hello, my mother has been diagnosed with fibro. about 3 years ago. She now lives with my family. It has caused her to quit her nursing job and sell her house. She currently takes 8-10 percocets aday. I think they are 5mg. Is that to much medication? Sometimes I wonder if the pain of fibro is that bad or is it addiction to the medication. What kind of pain does it cause. Is it hereditary? She describes it as flu aches, but would pain killers help that? Any info would be greatly appreciated? I have read on the sights, but i would just like to talk to people that have their own experiences. Am i not being supportive enough? Thank you