I caught a sinus infection (stuffy nose was the only symptom) when my husband was in the hospital and so I couldn't visit him. A family friend reminded me of H2o2 that he's been taking for years so I used the recommended dose in the book "the One minute Cure" by Madison Cavanaugh:
Take 35% food-grade H2o2 and dilute it to 3% (one oz of food-grade 35% H2o2 + 11 oz of distilled water = 3% of Food Grade H2o2). Then put the 3% in a spray bottle. Spray into your nose and mouth every 2 hours and when spraying into the mouth breathe in deeply.
My sinus infection and all related symptoms were gone in 48 hours.