Dr.Three months ago I thought I was coming down with a cold.Bad cough and clogged throat . After one month I took antibiotic.The discomfort continued and from time time I get a terrible headache on the right side of my head.Also at times feels like I have and upper tooth ache.I have recently taken mucinex which relives the mucas a bit but when stopping the thick mucas clogs me up. My Dr. Believes it can be allergies.