I feel my tongue is thick; in appearance it looks the same. I feel I am not speaking clearly; my peers say that I am. What is going on? This has just happened in the last week or so.
I have absolutely no way of knowing what has happened, but wonder if perhaps you bit your tongue in your sleep, have had dental work recently, have started a new medication of some kind, or have introduced a new herbal tea or something. These ideas are not meant to be a solution but are simply to help you think about what might have changed. If it persists, see a doctor or voice professional.