I've been having sinusitis since march 23 how long have that been since now I'm ready for it to go away how long will it go away?

Sinusitis. If you have been taking Amoxicillin and it has been over 2 weeks and you are not recovering then you may need to follow-up with your doctor. Another antibiotic, or other medication, or a longer course of treatment may be needed. Ten or more days of antibiotics is sometimes required to clear a bacterial sinus infection.