This happened to me while pregnant, the combination of all three pregnancies so close meant that even antibiotics didn't clear them and I needed surgery. It's taken two years after the surgery to sort it out too but it's finally getting improving.

You might need strong antibiotics to try and clear it but also use a nasal rinse not just fess spray, take vitamin c, drink lots of water if it's still the same ask for a scan of your sinuses to see what is happening.