Core features of the condition may or may not include debilitating fatigue, night sweats, and tendon stiffness. Fibromyalgia is a painful diagnosis that is known for it being time consuming to treat and improve from. Many people afflicted with Fibromyalgia frequently deal with a range of other symptoms that involve more than one body system, including difficulty with swallowing and diffuse sensations of numbness for example sleep bruxism.