Please come down for a proper ENT checkup. Let me examine you and advise you appropriately. Please do not take any antibiotics as suggested by some of my less experiences colleagues here.
If you only want to self medicate, I suggest you do Jala Neti. A 300ml jalaneti bottle and jala neti salt plus are easily available on Amazon. One scoop of that salt in 300ml warm water to irrigate and clean up your nasal and sinus passages should help.
Next Steps
If however the situation persists, you are welcome to come down and meet me. My contact info is freely available on Google Maps.