It's all confusing. I have derealization and depersonalization because of PTSD. I just found out cause I described it to my therapist and he told me that's what it is called. I thought I had panic attacks too but they didn't diagnose that. It happens when I'm stressed in public or in groups. And it happens when I'm anxious about social gatherings. It can happen when I'm driving and I zone out and I'm driving but I can't focus so I might miss my exit on the expressway or forget where I'm driving ( that happens mostly when I'm having a flashback or thinking about anything upsetting). In public, sometimes time feels like it slows down, or I'm invisible and people are moving fast around me but I'm standing still and it is like tunnel vision. Sometimes I can hear what happens but it seems like I am trapped inside myself looking through my eyes to the environment. Or it is like I am outside of my body and I can see me and know what is happening but I can't feel anything. Most of the time when I realize it is happening, I make a quick exit and it is over. But if I can't escape, it is worse and then I just observe the environment and don't talk.