There are many reasons for the foreign body sensation in throat.
You must consult an ENT specialist
and get done a Flexible fiber optic naso-pharyngo-laryngoscopy
------ to see for the inside of the throat at the level of vocal cords.
In addition recurrent cough could be because of reflux or acidity.
for reflux take---Antacid
Syp. antacid gel 2 tsf two times a day half an hour before mealsmultivitamin
Keep head end of bed elevated.
Avoid alcohol, Smoking
Do brisk walking daily
Go for walk after dinner
Avoid spicy food
Avoid late night coffee
follow up after 7 days.