Hello, This is Dr. Klarida Papaqako answering your question. I read very carefully your description. Something you have not mentioned above, but may be a common cause of frequent chronic sore throat together with cough, is gastroesofageal reflux, which because of the reflux of acid in the throat may cause this sore throat. Acid gets in the lungs so cough appears as symptom. It has a nonspecific appearance on throat examination, so people may do all sorts of labs and treat throat infection, but at the end it does not get better. I would recommend that you take omeprazole 20 mg once day for 2 weeks, try to not have dinner late, keep your head of bed slightly high when sleeping. If all these advises work to make your sore throat better, and relieve cough, then that confirms the diagnoses. Hope information helps, Take care.