Fibromyalgia is a recognised chronic condition of widespread pain and profound fatigue. A common illness with an est. prevalence of 2.9% - 4.7%. The pain tends to be felt as diffuse aching or burning, often described as head to toe. It may be worse at some times than at others and may also change location, usually becoming more severe in parts of the body that are used most. Add. symptoms often include: unrefreshing sleep, headaches, irritable bowel, cognitive disturbances, clumsiness, dizziness, allergies, sensitivity to environmental changes.