I'm pretty rational and I chose to become happy, and now I feel happy most of the time. I'm continuously choosing to be happy.

Idk if that's some valid evidence for you (or if you even care after 10 years lol), you'd have to believe me that I'm rational and that I'm actually happy, but there you go :D

How exactly did life become difficult for you?

I have local lows when I encounter difficulties, but those pass pretty quickly as I approach or solve those difficulties.

Wouldn't the prior odds in the bell example be 1:4 when the chance is 0.2? But written is 1:5.