Yes, I can relate and understand. But for me, the anxiety dissipates, probably by something psychotic, it's transformed into an irrational state, too stateful (as in devoid of elaborate, slow dynamics, like rationality; apparently stuck in a moment/state) to turn into delusional thinking or (maybe, even) hallucinations, just behaviour. Sometimes the behaviour is so simple it's catatonic.

But still there can be fear. But then it is more delusional and hallucinatory too, in my experience. It appears similar to derealisation, but it is different because you really can't think.

It's (like or a form of) thought-blocking.

It can be depressive (but highly anxious), non-affective and manic, in my experience.