When someone is dealing with a big difficulty, there is a proverb in my language which says: "die or cure". It means if there is a way to solve the problem then do it in any possible way, and if not forget about it and then don't worry about it anymore. Example:
Person B) What's wrong with you George?
Person A) Nothing! Just Kate is going to come to my work and make me lose face. She is going to tell all the story to the boss. I asked her not to do that, but she didn't agree and threatened me to come today. I'm really worried what will happen when the boss hears these all.
Person B) Don't worry man! Let it happen .......[the proverb].......
Is there any equivalent for this proverb in English?