I think I am, I know I am

I don't know what it is, but I feel very very strange at the moment. It's a sort of fluttery, light feeling. After several weeks I've stopped feeling physically unwell. There's no sign of the Black Dog, no matter where or how thoroughly I look. Everything is the same on the domestic front as it has been since time immemorial, but even so this weirdness persists. There's something very odd going on.

Ooh, I've had a recollection! Now I think I remember this feeling, and I can recall its name.

It's called Happiness. Hurrah! :)