I have this weird sensation like... Something has moved in my throat for a fraction of second. Or something is knocking gently. I am afraid weather it's because of heart or something. I feel very anxious as I am unaware of what's happening. First incident happend in Sep,2021. After that it happens atleast once a day. My observations: 1. It happens mostly 95% only in sitting position. 2. After such incident, sometimes I get a big burp. 3. It only happens after I have my first meal in the morning and 90% in office hours.