Maxillary Sinus haziness could be due to an acute infection and does not necessarily explain your symptom completely.
Next Steps
I would recommend you to use an antibiotic for atleast a week and get a NCCT PNS done after a course of antibiotic. Meanwhile start Fluticasone Furoate nasal spray as well.
Health Tips
Steam inhalation can also help relieve mucosal congestion and its importance should not be understated.