roji
Welcome to HealingWell. I would strongly suggest you start with your PCP for a medical screening exam to rule out any problems with your throat.
Many people with GERD have a condition referred to as globus sensation; a condition that is denoted by the feeling of fullness in the throat. Some people describe this sensation as feeling like they have a mass or lump in the area of their throat.
Make that appointment soon as it is better to know then wonder what is causing you to feel this way.