It's amazing how people think a virus that lives latently in B cells and epithelial cells, and is strongly associated with various forms of cancer among a big helping of autoimmune disorders, is incapable of causing post-viral syndromes. No, it must be anxiety, of course!

EDIT: Just because a disease makes you frustrated because you can't really do anything about it except empathize and listen, doesn't mean you can just slap the anxiety band-aid on it and call it a day.