I have an aquaintance who says he has CFS, and not CFIDS. He is also telling me I have CFS and not CFIDS. He explains that CFS is fatigue due to poor sleep with Fibromyalgia pain. He goes on to say that CFIDS involves the immune system, and CFS is simply from poor sleep. My stance, CFIDS/CFS are the same illness. Am I missing something? I am an RN who has extensively researched my illness. I can't get my point across to this person. I would appreciate help!