uhm well fish have worms, that normal. Fish eat worms... hmm thats normal to. I dont get the big deal? its a worm, its dead, its cooked, its probably harmless. Its not that hard to pick it out, get over it.
I would have charged them extra for the additional meat and protein, call it an upgrade!!! I can't stand people who moan about this kind of thing. All the food we eat has bugs and what not in them and you are naive to think differently. Take breads or cereal, do you really think they clean every piece of oats or wheat before it gets mulched up, or ketchup, do you think they get out every bug from the tomatoes before they squish them????? Hahaha...... get over it!!! Good luck eating your lunch now!!!