If you had cold then do take care of nasal dripping inside the throat , get examined for nose and if required get done a CT scan
of nose and paranasal sinuses
coronal cuts limited view plain scan after consulting your doctor
Also take care of reflux or acidity by --
avoid late night coffee and tea.
avoid alcohol and tobacco.
avoid binge eating
, take small meals 2hrly.
reflux of food is one of the reasons for recurrent irritation in throat.
give voice rest.