Whilst I do not have CFS I do have Fibromyalgia and chronic fatigue is a symptom of that as well. I would recommend going to your general practitioner and getting in to see a rheumatologist. That is who I received my diagnosis from. I'm sorry but I'm not certain of the diagnostic procedures for CFS.
The way I manage my chronic fatigue is to allow myself tons of breaks throughout the day and allow myself not to feel guilty for needing naps or extra time to do things that would take a typical individual less time. I exercise to the best of my ability and yes sometimes overdo it. I am still coming to terms with my own limits. It is best to know your own threshold and to ask for help when you need it. Let those around you know what you need and don't feel helpless or guilty about asking for help. I try to eat healthy but do allow my own indulgences. I don't drink or do any type of drugs as drinking aggravates the fatigue and I'm not a drug user. I only take my prescribed medications. I found that having my vitamin levels checked was very beneficial because I was extremely low in vitamin D, B12 and iron. That made my fatigue worse. While no I'm not better and probably never will be I am doing better with the addition of vitamins and medications along with all the other things I mentioned.
I wish you the best.