Describing Narcolepsy Symptoms to a Doctor

So I have a sleep study to see if I have narcolepsy but I feel like a huge imposter when I say I might have it because I have such a hard time putting my experience into words and they don't understand what I mean when I say I blackout and then pass out for normally 2or so hours but when I'm blacked out I'm normally aware for about 10-15 minutes but they said that that isn't the same as fainting how would you describe this type of episode better to a doctor. or what are your experiences with the episodes if you don't mind sharing