Desperation over my "mystery illness" has led me to this site, though I do not have CF. For more than 20 years (I am 48), I have lived with sporadic bouts of a "mystery illness" in which I experience debilitating fatigue, muscle aches, fierce headaches, and an inability to concentrate. The episodes last anywhere from 1 or 2 days to a week, and occur as many times as once a year to once or twice a month. They sometimes follow a period of stress, though not always. I am now experiencing a bout of this illness that is now in its third week....the longest ever. I have a supportive family and a supportive boss (I work part-time; I had more episodes when I worked full-time) and do not suffer from depression (though I get depressed when I get this illness!). Besides the "mystery illness," the only other medical condition I have is a heart arrythmia that is controlled through medication. I just had a complete physical. The doctor seemed to take my "mystery" symptoms seriously and did some extensive blood tests, but proclaimed me to be "perfectly healthy." But I'm not perfectly healthy! And I don't know where to turn next. Any suggestions would be appreciated. Thanks.