i've got that feeling at the moment - something (or my psychosomatic projection of something that may not actually exist) has taken up temporary lodging in the back right part of my throat. the kind of little bit of something that causes a mildly unpleasant tickling sensation of "hey you usually don't feel something here".
like a piece of metal/plastic confetti that got stuck to the back of your throat and its edges are sensed acutely by all the nerve endings or whatever in the area. i actually did get a piece of metal/plastic confetti stuck there one time when i ate a mint out of a tin that was filled with the confetti and a piece had gotten stuck to the candy without my knowledge.
and no matter what you do, how much water you drink, how much horrendous hacking and hocking you make in the bathroom to dislodge it (and cause your significant other great concern over your well-being in the process), it will not go away but of its own accord, at some point in time far past when you've already started to mentally block out the sensation. then suddenly it's gone, for reasons unknown, and the nightmare is over until the next time some bit of detritus decides that the back of your throat is the cool place to be.