The story of my nasal polyps

People that have met me in real life may know that I have a nasal voice, suffer from more-than-average sneezing and it often looks as if I have a chronic sinusitis. This started slowly 10 years ago, but never got really problematic. 8 years ago I went to a specialist who did not find anything unusual (sinuses were clean) and declared that I must be allergic to something.