I am convinced that Elizabeth Prentiss had CFS. As I understand it she would be bedridden for weeks on end with it and otherwise had poor health and little energy. The information is difficult to find....I've only read the book Stepping Heavenward which is fiction but contains many biographical elements, namely the illness, but I have yet to read her biography in full; I read the previous book back when I could concentrat better and now find I cannot focus well enought or ead the biography. But if some one else would like to it can be found for free here: http://books.google.com/books?id=_3...&resnum=3&ved=0CDYQ6AEwAg#v=onepage&q&f=false She is a historical figure best known for writign the hymn More Love to Thee I highly recommend Stepping Heavenward, I think it's available for free too. She becomes ill soon after she was married, if i remember correctly, but then again I only read the fictional account which may differ some on the details.