I'm sorry you are having such a difficult time. I'm not a mental health professional. And I can't tell you what this is all about other than to suggest that, perhaps, it is being driven by your anxiety.

Anxiety is something I've struggled with all of my life. And the one thing I know is that it can manifest in all sorts of different ways. Just as one example... one evening quite a few years ago now, I was at the theater waiting for a play to begin. Suddenly my eyes began to bounce up-&-down in their sockets! I couldn't stop it &, as you can probably imagine, it made looking anything a challenge. After a few minutes it went away. But there have been lots of other things over the years as well.

You didn't mention if you see a therapist. If not, that might be a good idea. Talking through your fears may help you to at least reduce their potency. And then other things that are sometimes suggested include journaling, meditation, yoga, etc. You probably don't need me to tell you about this stuff. But I do think it's important to address your anxiety-related issues in one way or another. At least based on my own personal experience, I'd say your anxiety symptoms may be unlikely to simply go away by themselves. And unrelenting anxiety does have a way of wearing on a person over time both mentally & physically. It certainly has on me.

Here are links to 2 articles, from PsychCentral's archives, on the particular subject of health anxiety:

OCD and Health Anxiety

Hyper-Worried About Your Health? 3 Tips to Help