It is debatable as to whether Fibromyalgia is a Rheumatic disease, so here is some information on the subject. On my questionairre I complete each visit to the Rheumatologist, some questions are if we had 'growing pains', Rheumatic fever, and many other things that were dismissed back when most of us were children. This info is fed into a data base and sent to the American board of Internal Medicine/Rheumatology. Autoimmune diseased falls under this umbrella.
http://medical-dictionary.thefreedictionary.com/Rheumatic+disease