Andy,
I don't see atrophy nor any reason for concern. I checked your original thread and noticed you reported chewing a lot of nicotine gum. As you noted, gum-chewing can affect jaw/facial sensations/clicking but I will add to that the fact that nicotine as a stimulant can affect body twitching, sense of unease and the like. If you are still taking in nicotine in any form, I would taper down and stop.
My suggestion to you, if you remain unable to seek treatment for health anxiety, a common and disabling condition, is to begin this year by visiting a care center where everyone is physically or mentally disabled, spread some cheer in this cold winter. Thereby find new strength in your own continued good health, as judged by what you can still do and the choices that you have, that many others, including most of those here, do not.
Best,
Laurie