It's allergic rhinitis. You need to use specific medications for 4-12wks depending on the severity of your condition. And to avoid exposure to dust , smoke , pollen or any cold foods which triggers your allergy
If you have already used the medications for prescribed number of weeks and still find no relief, then you have to undergo tests to find out which particular thing triggers your allergic reaction depending on which you can avoid exposure to those things.
Immunotherapy is also available which will be helpfull
Next Steps
pls consult an allergy specialist