it can go up to 2 maybe 3 weeks. Lots off water and healthy foods some extra vit C all can do good but it won’t make it go away as quick as you want it too. Might want to call the doctor for a Z-pac (antibiotic)

The best way to treat the flu, of course, is to prevent it. Getting a flu shot every year will greatly reduce your risk of getting the flu. Although it is a good idea for most people to have the flu shot, certain people should get the vaccination every year.