I've seen some herbal remedies work first or second hand in Latin America. I wish I could find a link to whatever it was my wife took in Costa Rica when she got the "bots". A local offered to either go to a local plantation and pick the leaves so she could make the tea, or go to the pharmacia and buy tablets. We needed tablets. It worked.

Garlic, cayenne and ginger may clear your sinuses but then again so will wasabi.