How many languages can you speak? Are you able to flick between them seamlessly? Did learning another language influence your first language in any way? Do you ever find yourself thinking in your other languages?
That sensation of repeating or rereading a word until it no longer makes sense is unnerving. It's like unraveling a ball of string or picking at a scab.
The word is now a virus. The flu virus may have once been a healthy lung cell. It is now a parasitic organism that invades and damages the central nervous system. Modern man has lost the option of silence. Try halting sub-vocal speech. Try to achieve even ten seconds of inner silence. You will encounter a resisting organism that forces you to talk. That organism is the word.