Doctors are not medical forensics. It shouldn't matter that the mechanism behind CFS isn't known, there's ample evidence that the condition is real. So I reject

Doctors are not medical forensics. It shouldn't matter that the mechanism behind CFS isn't known, there's ample evidence that the condition is real. So I reject that casual dismissal. However, there is no known way to treat CFS. That problem is a much more valid excuse for a doctor to do nothing. But a doctor that refuses to acknowledge a patient's troubles because they don't know how to treat it is a bad doctor.