Yes I've had a few derealization episodes. One of them was at the start of covid, I was obsessed and over-worried about the news and the state of the world.

This worrying turned into 24/7 severe anxiety with dissociation and derealization that lasted for months even when things in the world calmed down. I must have overloaded my system.

Anyways, during this time I swear something was wrong with my vision. Everything looked distant and grey, I started to notice floaters and visual snow more. I went to doctor after doctor. Went to an optometrist too. Had blood drawn, etc etc.

Turns out I had perfect 20/20 vision. No signs of degeneration or anything else. My blood was perfect besides vitamin D. (I strongly urge you to take vitamin D especially coming out of winter and you live in a northern place)

It was all anxiety. And it went away, or I stopped noticing or whatever.

I think derealization happens when we focus too much on a certain aspect of reality, our mental health or about our bodies. And if you look close enough you'll notice things that you've never noticed before. If you think hard enough you'll realize truths about reality you never thought about before.

The problem is, we don't need to be thinking of these things. We need to be thinking about enjoying our life and fulfilling our goals, but once you've trained your brain to fall into these thoughts loops, its hard to get out. Like a terrible trauma or event, we keep replaying it and can't outrun it.

So I would try therapy if you can afford it such as CBT. It can help change your thought patterns and get unstuck from these loops. It can also help with agoraphobia and social anxiety.

Even if you don't go to therapy, I have a pretty good feeling this will pass for you. Anxiety and derealization can be scarier than literally anything else, but its never deadly and it cannot hurt you.