Yes: A bacterial sinus infection usually takes 7-10 days to develop. Now that it has been 3.5 weeks, this sounds most likely to be an infection. You should see a doctor to be placed on an antibiotic for 7-10 days. It would be advised that you use nasal saline spray 2-3 times a day purchased over the counter and i like to recommend Mucinex (guaifenesin) taken twice daily for about a week to help thin the mucus.
Answered 3/22/2020
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