Dawning Glory...
it was an epic fantasy about a general whose biggest fear was admitting to having fears, who had incredible magic but couldn't use it without going insane, who went to war in a continent where war leads to the apocalypse, who loses everything and everyone but keeps fighting anyway.
ETA: *hugs Karla*
Karla, I know what it's like to be super sensitive, but really, it's what makes you an amazing person. Being able to feel with that much intensity makes you so kind and good and special. I know it's tough-- my hatred of my sensitivity gave me an ED-- but you're perfect the way you are.