hi,,

I faced the same problem after coming here,,For me it was because of dust allergy and it was too severe and chronic ,My voice too had changed for sometime.Initially i was used to nasal drops ,,but later i found that regular usage of nasal drops can also block ur nasal cavities,,Try to avoid nasal drops for prolonged time,It will ultimately block ur nose..I dont remember the name but a health care doctor had treated me,,and i was prescribed some aqua based solution to replace nasal drops and it worked for me well after a year long treatment.Try to avoid dust as well,do not use carpets at home..

Hope this helps but it is better to seek medical advise asap..