a diffrent kettle of fish
a new situation that feels like it was written by a very angry person
You thought you had one problem. Now you’ve got one problem, two problems, and a problem that’s written in all caps.
You had a small argument. Now you’ve got a small argument, a big argument, and an argument that your mom is now in.
You thought you were going to pass the class. Now you’ve got a class, a teacher who hates you, and a test that looks like it was written by a very angry person.