I think it's just psychological, or something. You probably got rid of it awhile ago but you're throat is still feeling it because it's not used to having big objects stuck in it (or...?).
Anyway, this one time I got a single grain of rice stuck in my throat. It was annoying. No matter what I did I felt like it wasn't moving, and then I finally said fuck it and went to bed. When I woke up, I obviously didn't feel it anymore because I'd forgotten completely about it.