No stuffy or runny nose, no fever or sinus pressure but mucus has been in back of throat when I swallow for weeks, throat has been irritated for weeks?

Look at diet. Sounds like allergies and when you have no other respiratory symptoms, consider food allergy. My first recommendation is to stop dairy as it can increase mucous production. You could also have a silent sinus issue so if you are not seeing significant improvement off dairy, see your doctor and consider allergy testing.

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