Suggest Treatment For Sinus Infection

I had misdiagnosed viral bronchitis and told it was allergies. Lasted over a month. I went to a doctor, lung xray fine, no allergies, asthma testing and it was negative. Ultimately, he thought I had a sinus infection and gave me zpak. It improved. I still have sinus pressure. It goes away when I drink apple cider vinegar and then comes back until i chug more. It has been since June 17 when I got sick that I have had this problem.