From WebMD, https://www.webmd.com/mental-health/depersonalization-disorder-mental-health#1, I got this: Depersonalization disorder is marked by periods of feeling disconnected or detached from one's body and thoughts (depersonalization). The disorder is sometimes described as feeling like you are observing yourself from outside your body or like being in a dream.
I don't struggle with this as you ask. My experience has been when I'm in a really anxiety-causing situation, in the past, all the rush of adrenaline and cortisol, I've had this lightheaded feeling a few times, where for a moment I have felt sort of outside myself observing in a numb way. I've talked with other friends in the group who shared similar experiences of that out-of-body feeling brought on in those situations. I wouldn't say that I've felt disconnected for longer periods of time, except that maybe in the way that I always used to think too much, and thinking compounded on thinking, I felt like I wasn't present or living life. But that was more a "over-thinking 'feelinig' " and not the physical rush and lightheadedness that happened in a few examples for me in a handful of really flooding situations.