@sundance6 - It is not unusual for Fibromyalgia to coexist with illnesses such as Lyme arthritis and Rheumatoid Arthritis- two causes of pain and different treatments.
Fibromyalgia does not have any specific test for diagnosis. However, on physical exam there are typical pressure points on the body that are painful when pressure is applied. A certain number of them indicate a Fibro diagnosis. Fibro is also a disease of exclusion- testing negative for typical inflammatory diseases.
I recommend finding a well known Fibromyalgia clinic. The illness can be handled without strong pain meds.
I have fibro and my sister and mother too. One of my daughters was diagnosed at 15, a son at 10. Both went to a Pediatric Rheumatology clinic that also specialized in Fibro. My daughter had it worse, stress in college caused flare-ups. She was given IV Lidocaine by pain management clinic and it worked wonders for a while. Both are adults now- now and then they get flare ups, but have learned how to manage. Fibromyalgia is also a type of sleep disorder- non refreshed sleep. Proper sleep training is also important to get good sleep and less pain.