Not that a trigger warning is something it needs, but Greek Mythology, and even history can be pretty damn shocking and graphic in nature.
I still think you're being too sensitive if you get into a panic attack because of an account of an event that happened 2600-3000 years ago, but there are plenty of parts that could make you uncomfortable.
There's a significant amount of rape and murder.
But then there's also a lot of people being turned into pigs, and deity mothers attempting to flirt with their mortal sons in disguise.