I Have Had Sinus Problem For Two Weeks Now. I

I have had sinus problem for two weeks now. I was given amoxicillian clav but could not handle the diarreha. After four days I started zpack, which I finished one week ago but still feel ill. Ent took nose culture and said ith is positive for bacteria. Now have a rx for cefdinir...I am so afraid of taking yet another antibiotic. Will I be able to get rid of bacterial sinusitis without antibiotic?