<qa>  What is the name of the test that will be performed before and after visits?Procedures include: a screening interview, diagnostic interview, analog rating scales, and psychological and psychiatric rating scales; b review of medical records if the diagnosis of fibromyalgia is not certain; c pain will be measured by palpation at tender points and by measurement of biceps reflex that objectively measures amount of pain both before and after visits, d Visit A will include a special diet for breakfast at 8 AM and resting at room temperature for 2.5 hours both known to turn off brown fat before receiving FDG radioactive sugar and a PETCT scan to measure metabolism e Visit B requires another diet and resting for 2.5 hours at 62F both known to turn on brown fat along with the PETCT scan to measure metabolism and a structural MRI to examine brain structure and to measure volume of brown fat in chest; f blood samples will be collected to measure stress hormones before and after each warm or cold period; g pregnancy testing before PETCT and MRI. 