It's basically impossible to die from Quetiapine. That's why it's so safe to give to people with suicidal thoughts. I have bpd and take Quetiapine. I don't actually know of a single death due to Quetiapine OD. Even if you had the massive amount of pills you'd need, you'd throw up and or fall asleep before u can take enough. If u add in anti emetics you're gonna fall asleep even faster.
So no, Quetiapine won't work. But chances are it will mess up your heart permanently. Not enough to kill you, but enough your life even more miserable than it feels like now.
It's not worth it.