Help - Another sinus infection

A month ago I got a pretty bad cold which turned out to be a sinus infection. Was prescribed antibiotic which def seemed to help and felt pretty good for about a week. Now I seem to be relapsing or coming down with the same thing again: congestion, yellow snot, terrible, uncontrollable cough that is SUPER LOUD and sounds like a bark. 
Anyone else had this twice back to back? I'm worried about taking another round of antibiotic but I'm truly miserable.