The most telling symptoms are fatigue and muscle aches which are normally absent with a cold. There is no cure for the flu. It's a virus and has to run its course. Your goal is to minimize the discomfort and prevent complications. Warm liquids soothe your throat and relieve nasal congestion.
Liquids replace body fluids lost through perspiration caused by fever.
Gargle with warm salt water. Lozenges or hard candy will help lubricate your throat. Avoid cough suppressants. Coughing helps your body rid the lungs of mucus that could cause pneumonia. If your phlegm is bloody, yellow or green, contact your health care professional.