Elderly family member with profound extreme fatique, very debilating, h/o mild anemia - hgb 9 -10, bone marrow biopsy neg. ECHO showed EF 55%. History of Type II DM, afib, on anticoagulation, PMR, off steroids Oct, 2013, when symptoms of fatique began and has progressed to profound fatigue. All diagnostic testing essentially negative, except sed rate - 126. Started on high dose steroids, with no response.
Any ideas on cause?