I was recently diagnosed with cfs after many tests. (Even had xray of chest and face). I have stuffiness and post nasal drip (especially in the morning). My doctor said this is unrelated to the cfs and gave me allergy medicine. I've read that sinusitis can cause fatigue, so I was wondering if this might be it instead. Although the xray test said everything was normal. Does anyone else have nasal/ phlegm problems as a symptom of cfs? Is this common, or should I take more tests to cancel out other possibilities.