I have always been under the impression that CFS was when you have have fatigue over a period of 3 to 6 months that never gets better.Comeing on after a mental or Physical Illness. I thought you could get this from a lot of different illnesses both mental and Physical. Is this right or is it a different deseas its self ? Do we all get it from different things or did we all get it from the same deseas? example ...I believe I got CFS because my Physical body could not deal with both mental stress and Physical pain from un Dx health problems. Can someone get it after an infection and another person get it from stress after a loved one's death?Both having different causes but both getting CFS. If we get it from different things I do not know how ONE thing could ever be discovered that will heal us . I hope this makes since.