I Am A 38 Year Old Woman. Last Year My

I am a 38 year old woman. Last year my legs started to throb and ache, from my lower back and buttocks down to my ankles. The pain moves around from leg to leg (ie the right thigh will ache one day, the left calf and ankle the next). I am in shape but the pain is makingbit increasily difficult to exercise. I have little to no lower body flexibility any more. The pain can be severe at times, making it difficult to walk. It also keeps me awake at night. I have beem diagnosed with fibromyalgia but as my symptoms only affect my lower body I question this diagnosis.