Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
As per your complain and presentation of symptoms it is pointing towards a condition known as Gastro-esophageal reflux disease or
Acid Reflux.
The urge to burp, closing of throat and feeling of something refluxing up the throat is due to refluxing of acid from stomach to throat and mouth and is more during lying down because of the posture and acid is more easily refluxed in lying down condition..
Nothing to worry consult a Gastro-enterologist and get evaluated and if required he will advise you to get an Endoscopy done..
If acid reflux is confirmed he/she can advise you to take
Proton pump inhibitors like
Pantoprazole or
Omeprazole, antacids like
Milk of Magnesia and avoid spicy and acidic foods.
Drink plenty of water.
Avoid heavy meals and take small meals after every 2 hours.
Eat atleast 2 hours before sleeping and take a short walk after meals.
While sleeping keep your head at a higher position than legs..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.