Some burning sensation. Was coming from.

I think it's been 3 years which I encountered this sensation in me. It's actually a burning type or some discomfort feeling under the area below my neck. I ignored first time which I got it in my graduation final year. Later it got solved by itself. After a year later I got it again but doctors prescribed some medicine & it didn't find it afterwards. But now again I'm getting it & now It was somewhat hard or I don't know it whether it's highest pain or not but it was staying for 30sec or more & I'm getting it from 4pm-9pm, now the sensation is not that much hard but it was staying under my neck for such a long time. Google is telling that it is GERD, but I want to know why & what it is was coming from. Thanks in advance doctors.