I know how you feel because when I was 21--fifty years ago--I almost died from influenza gone bad and ended up in the ICU for a month and hospitalized for some months after. I had a classic near death experience, too. This was a lot to process at a young age. Until I was 30 or so I felt like I was floating, that things weren't quite real. And I felt different than other people in a lonely way. Eventually I learned how to balance out an awareness of death with an ability to engage with life, but it remains complicated at times. Is this your first strong experience of feeling untethered? (good word!). Is the feeling totally unpleasant or does it have some freedom in it? I'll add that I've been aware of death every day since I was 21, and it has made me appreciate life more fully, while realizing it is impermanent. Thanks for the topic--an important one.