Thank you very much.
There are few important reasons for this.
First, this can be due to inflammation of the nasopharynx as a result of allergies.
Secondly, an infection involving the mucosa of the nasopharynx can also give you similar sensations.
Finally, Gastroesophageal Reflux, when become very severe, can lead to spilling of stomach secretion in to the throat, often at night when one is sleeping and not aware of this. These secretions damage the mucosa of the throat and hence you can get similar feeling.
Right now following measures will be helpful for you;
Avoid large fatty and spicy meals
Small frequent meals, soft diet will help
Plenty of luke warm liquids like green tea, coffee, soups will help
Avoid lying flat immediately after the meals
If this persists, does not improve or get worse, see you doctor for a clinical examination and necessary tests to chalk out further management plan.
I would have been worried too if i were at your place but let me reassure you that this is a treatable condition and carry a good prognosis with appropriate management.
Wish you good luck.
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