It is not possible for Sinna to have caused your problem, you can safely keep on taking it. It can be combined to any treatment.
-Drink hot water (ex. Broth and herbal teas), since it help reduce congestion.
-Eat a lot of raw foods; they contain high levels of antioxidants that help the immune system function better.
-Add a lot of onions and garlic to your diet, they help decongest and boost the immune system.
-Avoid food that causes congestion (ex. Dairy products, banana, oat…).
-Eliminate white sugar (reduce efficacy of immune system) and use honey instead.
-In cases of chronic sinusitis, find your food allergies or any other allergy that can irritate the sinus cavities.