Constant mucus won't get out my throats help !

Ma
Did anyone ever experienced a cough without really being sick and a thick mucus staying in the back of the throat no matter what you do ? It's been going on for at least a week but the coughing is been going on for almost 3 weeks.. I'm getting so tired of it and I can't clear my throat enough. 
And when I cough it almost gets me to throw up because it's so deep and I can't catch my breath..!
Robitussin, Tylenol, tea, honey, salt water tried it all, now mucinex.. still the same ! Anyone have an idea what it can be or how to get rid of it ? 

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