"Depersonalization from panic attacks usually disappears."
Situation is, many people have panic attacks. Maybe only once, but there are others who experience "panic disorder" for years, but never develop chronic DP. I want to help you guys understand why. The difference between those who do experience a panic attack but never develop chronic or even transient DP, and those who experience only one attack and then experience chronic DP is this: the latter group has a stored mental "program" in them, that eventually creates DP in them. And that "program" originates in EARLY childhood trauma.
Young children (infants), who experience extreme traumatic situations, usually interpret their experience / deal with that experience this way. The traumatic experience is soo overwhelming to them at that time, that the only thing a child can do is kind of make him/herself believe that "this is not real". Or "I am not real". If what happening around me is not real, or I am not real, then this is not a problem. This is the ONLY thing they can do. A little, 3 year old kid, experiencing abuse from a psychopath (like me), or going through EXTREME emotional trauma, like the feeling the child feels during family fight or something like that.
And this gets stored: extreme fear ---> making myself believe that me or the world is not real.
Now, if this person experiences other traumas, or developes cognitive distortions, etc.. in one sentence, developes or experiences "stuff" that can create a panic attack (it can be VERY different things, maybe only one stressed week or an unresolved problem that is in them for years, finally blowing), this "software / program" from childhood starts. And the person has no idea what is going on, because (s)he has no explicit memory about the event(s) that originally created that "software".
In those moments (DP moments), we are actually doing things we learned to do at 3 or 4 year old. When you experience a panic attack at 24 yr old, it is just not possible to - in all of a sudden - remember that this is a reaction you developed 20 years ago, and it is not up-do-date anymore. So we end up in DP. And we feel like something FUNDAMENTALLY changed in us. Which is not true, only a false illusion, even if it is VERY convincing.