I was locked in place and became infinity and was tortured for like 10,000 years as I saw the last moments before singularity, with rippling interference as the singularity grew and reality shrunk in chunks and waves. Everything stretched thin before me as I saw the undoing of all, and then suddenly I was in my bed with my cat, sticky with dried, melted ice cream cuddled into my arm.
Also I dropped the ice cream and the cat ate it 
So is this ego death people take drugs for the same thing as the depersonalization that just kinda hits me when I'm sleep deprived or whatever?
Nah, I think it's a different thing. Someone experiencing ego death will be totally unable to interact coherently with the outside world at all.