Past 2 days i've had a fever, chills and hot flashes but don't feel sick at all. i'm 24 what could it be the cause?

ER: If you have had fever and chills, you do feel sick. Go to the Emergency Room. Fever and chills are signs of an infection in your bloodstream. If you are not coughing/short of breath it could be coming from your urine/std or gastrointestinal system or from an abscess somewhere. It could also be a viral illness. Please get medical attention promptly.