My grandpa and grandma on my mom's side were both diagnosed with it, and while I've never gone to get it officially diagnosed since it's under control enough where I think medication wouldn't be worth it, I'm certain I have it too since I have episodes that fit it exactly.

For all of highschool and college, once every couple of weeks, almost always around 10 PM and generally when I'm more stressed, I'd have an episode. I don't hallucinate but every fiber of my being starts to believe a really particular delusion. I really hate mentioning what it is, it's embarrassingly stupid sounding to me outside of an episode, and in an episode thinking about the fact people know that I know the "truth" makes it a whole lot worse, but here it goes: I believe that my life is actually a work of fiction, that I'm a character and my actions are being written by someone else, I'm being watched by some sort of audience or readers, and that if I do something my "character" isn't supposed to do or let it be known I'm aware I'm fictional, the entire world could be erased by the author.

I can feel it coming on about an hour in advance, sometimes, I just start to feel more and more nervous and not know why but often times I can recognize it and tell family members I'm feeling off (and they know what that means), then suddenly I'll just have the thought enter my mind that I might be fictional and as soon as it goes in it becomes absolute truth for the next four or so hours. It's suddenly just a fact I know as strongly as one plus one. Nothing anyone can say or nothing I tell myself can stop it. My family and now my boyfriend who I live with (unrelated but I'm also a guy) can tell when I'm in one, and basically all they have to do is keep watch, interact with me very little (any interaction stresses me out to no end, because I feel like the world could literally stop existing if I don't act casual and only say "in character" things), and never mention absolutely anything about what my delusion is. It ends up passing eventually so long as I'm left alone, most of the time I just end up pretending to watch TV while silently panicking the entire time in my head.

They were at their absolute worst going in to college, but thankfully they've become shorter and less frequent as my life improves and I get less stressed out.