I was doing homework one afternoon when I was 11 or so when all of a sudden I felt the happiest I ever had in my entire life at that moment. It was intense. I rushed through my math problems and even wrote a long note to the teacher about how stupidly easy those questions were. I was so happy I didn't care to notice that I got every single one of those questions wrong. When my mood crashed the following day, I looked back at the monstrosity of a letter I had wrote and hastily erased as much of it as I could. The teacher was still able to read it. I was so embarrassed.

I never connected that to bipolar until after I was diagnosed. Now I look back on it and it finally makes sense. I had a few more moments like that during my school years.