For the last 72 hours I have been constantly burping or trying to get myself to do so because of the constant feeling of there being air in my throat and stomach. It gets worse at night, during which my throat also begins to feel scratchy and I get a slight dry cough. It is making sleep very difficult. I have noticed that this feeling of trapped air subsides during and right after a meal. What could be the cause of this and how can I relieve these symptoms?