How can I undo a deleted draft on gmail?

I accidentally deleted part of a draft I had in my draft box on gmail. I worked really hard on it, and I don't think it's something I can rewrite the exact same way. I was forced to delete the whole draft, there's no other way, last time it saved it only had half of everything I wrote. I am really bummed, so how can i get the draft back? I tried the trash bin, tried refreshing the page. Nothing. PLLEEZZ some help?

(It was an outline of my story, in case you're wondering.)