What Causes Pain/spasms In Throat Below Adam's Apple?

i have been experiencing localized pain/spasms in the left/center of my throat just below my adam's apple. it literally appeared out of nowhere while sitting at the computer and hasn't completely gone away since (some days it's less noticable than others). the best way to describe it is that it feels like a combination of something stuck in my throat (like a pill) with the sensation of my throat collapsing/closing up. it's very uncomfortable...