Idiom of the day :- Eating Someone

Usage, examples and definition of the Idiom :-

Hey, Alice. What’s been eating you lately ? Don’t you realize how rude and irritable you’ve become? I know. I’m really sorry for the way I’ve been acting. Well, why don’t you tell me what has been bothering and upsetting you and maybe we can work your problem out together. I’ll admit that it would help to talk to someone about it.