I Have Had Flu-like Symptoms For About Three Weeks Now.

I have had flu-like symptoms for about three weeks now. Mostly I have been fatigued, slightly achy, there is a lingering cough (especially prevalent at night). I have not had a fever or anything really serious. I have also had a bout of pink eye at the same time. This is all abnormal for me since I am normally quite healthy (exercise often, young, eat well, etc.). Is there anything I should be worried about? Or am I likely over-thinking this.