Sinus infectie

I’m suffering for about two weeks now with sinus infection and it really making me feel unwell that i cannot even go to work. And today i called the huisarts to make an appointment for check up,so i came there and the woman did finger prick blood to see if i will be needing an antibiotics and the result is no. They didn’t even give advice etc,in short, coming there was useless. My question is, is there any other way help me treat my sinus infection? Thanks in advance.