DNS can cause rhinitis and this can allow the nasal secretions to flow back into the throat like a drip and this can cause problems for the throat. DNS can cause breathing problem at night and thus lead to snoring, and this can lead to dry and irritative throat in the mornings and daytime. A DNS can cause nasal obstruction and this nasal obstruction can bring about a change in the voice.
So please see your ENT specialist and listen to him