Thanks for writing to H.C.M.
I have gone through your query regarding coughing during swallowing dry foods, sore throat
and white tongue.
As you noticed white slough at the back of throat from time to time this indicates recurrent tonsillitis
and for the same reasion you have enlarged neck lymph
nodes. This in turn developing chronic laryngopharyngitis which you have observed as change in voice and dryness in throat.
I would like to tell you to please consult any E.N.T. doctor for tharough examination and proper treatment.