I think I had an episode of depersonalization back in January. I was having a really bad period that month, and I was having a lot of anxiety. One day, when I was eating something, my phobia of choking kicked in (I thought I had swallowed a whole piece of whatever I was eating) and then, suddenly, everything felt very unreal, like I was walking around in a dream. I wondered if I had died and had gone to purgatory. This feeling lasted for several days, and I cried just about every night because I worried that my parents and brother (who I live with) were figments of my imagination and would disappear when I woke up.
The feeling eventually went away and I went back to feeling normal again, but it was very uncomfortable and bizarre while it lasted.