When in Doubt, Call Your Doctor
Any time you're not sure what's wrong with you, or you just feel awful, get in touch with your doctor. She can help you figure out what you're dealing with. Allergy medication won’t help you feel better unless your problem is actually allergies. If you have something like strep you’ll need antibiotics, but don’t take them for cold and flu. "Many people take them for [these illnesses], not realizing that they can actually make you feel worse," Clark says.
Remember, the best treatment is prevention. 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.