I imagine it would have to be visual -- plagued by images instead of sounds. There's really no other way to call to mind the obsessive, persecutory concerns that persist in sz.
I once read a book by Dave Eggers called A Heartbreaking Work of Staggering Genius. In it he used maybe the best analogy I ever heard for how the mind works. He wrote that it's like a library containing file cabinets brimming with your life's history. Every little memory, every episode is documented. And it's filled with little, insistent librarians -- which represent memory itself. The librarians are always calling something to mind, reminding you of something, however old, seemingly irrelevant, painful or unwanted the memory might be.
What's the SZ library look like. Are the librarians constantly misfiling information into irrelevant batches, allowing the mind to draw faulty conclusions and associations? Librarians bringing up stressful or provocative materials no matter what's at hand? Or is it just an open-air space with papers blowing hither and thither? Maybe there's no librarian at all.