I have blocked nose always since I was 17 years . And there is nasal drip also . The nastril on side i sleep remains blocked and when i shift other side other one blocks after couple of minutes . Occasionally i also feel sore throat and cough .But generally no other issue , no headache . But my eyes are also itching . When i use budanese i feel good but soon after i leave i experience same . What could be issue . Can nasal polyp be the reason .