Thanks for the query.
You seem to be suffering from an upper respiratory tract infection. A post nasal drip can cause a viral infection, laryngitis and pharyngitis. Do warm saline gargles three times a day after meals. Chew lozenges which have ginger and lemon. It will help soothe the throat.
Give some rest to your throat. If symptoms increase, see a Doctor for an examination.
Hope this helped.
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