I am suffering from chronic sinusitis for the first time of my life since 5 months. I decided at first to take Augmentin for 7 days. I felt an improvement but not a total relief.the pressure in my sinus was gone but i was suffering from Dizziness and my ear. On Wednesday i mean yesterday i took Zinnat 500 mg 2 times in the day..but i feel no improvement and i am even more dizzy then usual. How many days do i have to wait to feel an improvement and how many days should I take cefuroxime for chronic sinusitis.