I'm sorry you're not feeling well. When I am sick I tend to become anxious and worry about things. Legionnaires disease is a type of pneumonia, but it is not very common. But the symptoms would be pneumonia symptoms...so extreme difficulty breathing and a cough would be primary.
It sounds like either you're run down, or you have caught a virus. Definitely do check with your doctor, though, just in case you have the flu.
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