When in Doubt, Call Your Doctor
Pick up the phone any time you're not sure what's wrong with you, or you just feel awful. Your doctor can help you figure out what you're dealing with and point you to the right treatment.
Allergy medication won’t help you feel better unless your problem is allergies. And if you have something like strep you’ll need antibiotics, but don’t take them for colds and the flu. "Many people take them for [these illnesses], not realizing that they can actually make you feel worse," Clark says.
Practice smart habits that help you avoid getting sick in the first place, too. Get a flu shot at the beginning of each season, wash your hands regularly, and steer clear of other people who have a cold or the flu.