the muscles in your body need creatine to funct. Levels of CK can rise after heart attacks, skeletal muscle injuries, really strenuous exercising, muscle injurie et even drinking too much alcohol. Meds or supplements can cause it too. They should be checking you out more can cause muscle et heart damage. Not sure if related to fibro although fibromyalgia is wide spread pain et muscle tenderness. I'd want to get another opinion if they didn't do anything for you?? Hope you find something out et positive. God bless et hugs your way

Thank u