You may already know this, but, something like Flonase, Nasacort or Rhinocort over the counter is a good place to start before seasonal allergies hit. This spring has been horrible due to everything blooming early. I am prone to sinus infections. Also, have you ever used the NeilMed Sinus rinse? It takes a little getting use too, but, it cleans out bacteria in your nose and sinuses. It works! You don't have to use Flonase or the other mentioned sprays year round unless the doctor tells you too. I start on it right before allergy season hits and it helps. Also, I use a hepa filter in my house to pull allergens out of the air and in the winter months, I use a cool mist humidifier to put moisture in the air as being dried out can cause all kinds of sinus issues. I hope this helps.
God Bless You!