Chances are you have a low thyroid... apparently almost all of us do (see below). To address your fatigue, consider talking to a physician who knows about various infections... which would include the latest XMRV virus that the majority of CFS patients recently tested positive for.
To help with your fatigue... what has helped me in the short run : Braggs unfiltered apple cider vinegar (a capsize full) in my drinking water... Transfer Factor (expensive, but it has helped me) and/or treatment for allergies and pathogens that you test positive for. Treatment for infections is not easy and there is no standard treatment for viral infections. However... there is treatment for bacterial infections (two-thirds of CFS patients have high frequencies of mycoplasma infection).
T3 REVERSE -- "The mix of treatments needed varies from patient to patient. There are some abnormalities that are common. For instance, close to 100% of individuals with these syndromes have low thyroid. This is, however, usually not picked up on the standard blood tests because the TSH is not elevated in these individuals due to pituitary dysfunction. Many of these individuals will also have high levels of the anti-thyroid reverse T3, which is usually not measured on standard blood tests. In addition, the majority of individuals can also have a thyroid receptor resistance that is not detected on the blood tests. Consequently, thyroid treatment, especially with timed release T3, is effective for many patients. T4 preparations (inactive thyroid) such as Synthroid and Levoxyl do not work well for these conditions."
Kent Holtorf, M.D. --- link to article: http://www.chronicfatiguesupport.com/chronic-fatigue-syndrome-treatment.htm