What could my constant allergy-like symptoms be caused from?

I have had nasal drainage for over a month now. I’ve been to the doctor, had allergy tests, flu tests, even a cold test- which is rarely done. I’m not allergic to anything not even pollen, etc. But my nasal drip and cough that’s sometimes mucous-filled won’t stop. I also just bought an air purifier for our home... show more I have had nasal drainage for over a month now. I’ve been to the doctor, had allergy tests, flu tests, even a cold test- which is rarely done. I’m not allergic to anything not even pollen, etc. But my nasal drip and cough that’s sometimes mucous-filled won’t stop. I also just bought an air purifier for our home hoping it would help, but I unfortunately it has not. Anyone have any tips?
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