Drink plenty of fluids and take vitamin C.Vitamin C is know to help reduce the cold symptoms and the duration of the cold if you catch a cold. If you are using a topical decongestant use it sparingly. Take a antihistamine night it will help you sleep and breath better. If you have a fever and muscle aches it is best to rest and avoid any exercise. If you have pressure behind the eyes and nasal cavity you probable have a cold along with a runny nose.
Make sure to take aspirin or other cold medications in moderation. Treating the cold or flu evolves controlling the infections and get plenty of rest. Taking oral antibiotics such as amoxicillin, penicillin which are prescribed by a doctor will help. Longer use of nasal decongestants can lead to a rebound effect if taking to often. A cold can be very contagious and transmitted from person to person. You need to avoid skin contact and air born particles when possible.