Please help: Nonstop post-nasal drip causes constant throat clearing. Seen numerous doctors with no answers.

I've seen ENT specialists, Allergists, and other doctors who keep trying to treat my condition as an infection or allergy. Although test results have yet to show allergies are causing this. Antibiotics have had no effect. My nose is almost always stuffy and congested. When it starts running, the drip starts too. It can last for hours and has stolen hundreds of hours of sleep the last couple years. I can't put any rhyme or reason as to what triggers it but it seems to be most acute right after eating and when the weather is warm oddly. Co-workers and family are making comments on my constant coughing. Its really affecting my quality of life. Any insight would be most appreciated!
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