Two days ago I had a sudden onset of these symptoms: fatigue, muscular weakness, chills, low body temperature, and sleepiness. I still have these symptoms. I had a flu shot 3 months ago. Several people I work with did not get a flu shot and have recently had the flu. Also, my wife has had a bad cold for the past two weeks. Do you think I just have a virus? Or could it be something worse? I have not seen my doctor about this yet.