question: I have the symptoms of the flu but I do not have a runny nose, sore throat, or a cough. I feel slow, have a headache, body/muscle aches, trouble concentrating but it only happened within the past 3 hrs or so and the aches come and go in waves. I an t tell if I have a fever or not. I was fine at work, a little stressed, but fine and just prior to leaving was when I started to feel a slight headache come on.