I have been coughing to clear my throat for 2 years already and no medication seems to work. I have already used 2 bottles of mometasone aq nasal spray which only helped temporarily until it runs out and then im back to clearing throat again. Is there a permanent cure, I do not want to keep having to buy sprays as soon as it runs out? Doctor checked my nose before and said it was a bit swollen and that drainage runs down back of my throat. Thank you.