I was just thinking....
I was diagnosed BP1 somewhere around age 33. They hemmed and hawed at the 1 part for a while but finally conceded.
Before that, I did have some psychosis. At 20 I had my wisdom teeth out. During recovery, I saw little aliens knocking on the balcony sliding glass door. Later that week, I had some paranoia that "the dark" was "coming to get me". The windows were black from it being dark outside you see. I even called my mom who told me that the dark couldn't get me, but I insisted.
Before that, as a teenager, several times I thought I heard my sister calling my name from her room in a whisper. I'd get up and go see what she wanted but she was always asleep.
The wisdom teeth adventure may have been narcotic-caused, I don't know.