No, actually I don't know what "losing everything" feels like, but I DO know what "loss" feels like.
It feels....dark and empty. After my guinea pig died I felt like I had lost the world along with him, and it took me a while to ajust. I would go in my room and say something that I say to him, even though he wasn't there. I felt very lonely, lost in a dark, empty, floating world.....