Due to the symptoms you report -aches, chills, no fever, fatigue... it seems that you've been experiencing a common cold. The flu is characterized by a high fever (from 37,8 degrees Celcius up to 40 degrees) that is usually continuous. The flu comes on suddenly and the symptoms are much more severe than the common cold. Additionally, these symptoms may be present during other condition ...so you'll want to check out the possibilities with your primary physician. You can first consult your general practitioner and then seek a specialist for further diagnosis. It is possible that you just need rest.