[Duyere]

The term is called Post Anime Depression Syndrome, aka PADS.

It's the worst feeling after watching an anime, but it doesn't always happen to me.
It most often happens when I have deep interest toward and/or feel the anime is incomplete.

I'll have a connection to characters I'm interested while I'm watching/completed an anime but the feeling fades when I move onto a new anime.

[Duyere]

Spoiler (Click to View)He's not actually dead, watch all of Code Geass: Boukoku no Akito.
🙂

Spoiler (Click to View)Sorry to burst your bubble but the Code Geass: Boukoku no Akito OVAs are set in a timeline between the rise of the Black Knights and the supposedly dead Zero when he was said to have died in R1.

You can read about it here: http://codegeass.wikia.com/wiki/Code_Gea...the_Exiled

I was fooled too but Lelouch is still dead 😭