@dainamerritt

MCTD = Mixed connective tissue disease
"Mixed connective tissue disease, also called MCTD, has symptoms of more than one rheumatic condition. These conditions include lupus, scleroderma and myositis. Many people who have mixed connective tissue disease also have inflammatory arthritis and Sjogren syndrome. Mixed connective tissue disease is not common." https://www.mayoclinic.org/diseases-conditions/mixed-connective-tissue-disease/symptoms-causes/syc-20375147

"Fibromyalgia is a long-term condition that involves widespread body pain. The pain happens along with fatigue. It also can involve issues with sleep, memory and mood. Researchers think that fibromyalgia affects the way the brain and spinal cord process painful and nonpainful signals. That increases your overall sensitivity to pain."
https://www.mayoclinic.org/diseases-conditions/fibromyalgia/symptoms-causes/syc-20354780