Is Fibromyalgia proven and actually a medical condition/disease?

My mother has comlained about hurting all over ever since I was a small child. She now swears that she has this Fibromyalgia disease. I always thought she was working to hard or her head was playing tricks on her & making her think she was hurting. Or simply just trying to get sympathy from everyone. Stuff like that. Now she tells me that this disease is genetic & me & my sister could possibly have it or end up with it. Both me & my sister have various aches & pains like our mother describes but have never checked into it. Is it something we should be concerned about enough to go get checked? And is there a cure or medication for this disease to treat or relieve it at all?