I have had a nagging cough since last September. It is a tickly cough with thick saliva in the back of my throat. I have been to an ENT, had an MRI and chest xray and allergy testing. I also have a crusty nasal passage. The allergy testing revealed high sensitivity to environmental things such as grasses, molds, etc. so I have been taking sublingual allergy drops, which are not helping. I ve been taking them for about 2 months. Ironically, I had a sinus infection about a month ago, and the doctor (a different doctor than my ENT) put me on augmentin. I got well, and my cough completely cleared up, but I wasn t sure if it cleared up because the allergy drops were starting to work or because of the augmentin. After about another week, my cough came back. I do not feel like this is an allergy-related cough