If leaving out wheat helped your sinuses, it might be worth investigating if you have a Histamine intolerance (my wife has that, and the symptoms you described)

If leaving out wheat helped your sinuses, it might be worth investigating if you have a Histamine intolerance (my wife has that, and the symptoms you described). If you have indeed a Histamine intolerance, you'd know what other food to avoid (for example easily spoiled fruit like strawberries), and there are enzymes you can take if once you couldn't avoid such food.