Well, I suffer from OCD, 85% hypochondria. I experienced the same thing before I was diagnosed. It was after three months of one thing happening after another. From what I know, if it were anything serious, it would start off slowly with food and then eventually you would have difficulty swallowing liquids. The process would take months if not much longer. What you have explained, wouldn't happen that quickly unless you have something large stuck in your throat, which you obviously DO NOT HAVE. You couldn't have it, trust me.
Now the unfortunate part is that Hypochondria doesn't respond to Behavioral therapy. Only medication can help with Hypochondria, if that is indeed what you have.
But like others have said here, it could be strong anxiety over something. A fear of something, or some other form of anxiety. Bottom line, if you do not have hypochondria, do what people here are suggesting, like focusing on other things.
I apologize if you have received similar answers here. I'm a newbie but unfortunately, between being in the health care field and experiencing these things myself, I can relate to you big time.
Try, if you can, to repeat to yourself that it is nothing and see if that helps ok?
Good luck and all the best.