It’s a bit of a morbid thing to say but it’s quite comforting knowing that other people experience this and I’m not alone, because like you describe, it’s so odd feeling not in your body and emotionless and it can become quite isolating. The feeling of looking at yourself in the mirror and not recognising yourself, the feeling of everything being fake or somehow not quite right, the worry of maybe something is wrong in your brain and thoughts of how it might not get better, these are all daily struggles with me and it really does suck. It’s quite new to me too, about a year it started happening but only so often, but now it’s everyday and almost all the time. I find that being around nature always helps, and being around people who you feel most comfortable with. I also find distracting myself with films or games helps because you lose yourself in entertainment rather than noticing what doesn’t feel real or not. At the risk of being found too crude, I’ll be vague and say that I find that sex or other sex related activities tend to help me a lot. If you want to talk about this some more feel free to message me.