you might be on the terminal elimination path (thank God), because for sure this frequency works on these extremely large worms
I think they are Tapeworms because I feel some "bony" structure, unless these are extremely large monster hookworms (ancylostoma caninum has apparently extremely large hooks and this could be tropical Australian version?)
so I agree this could be Australian speciality as nobody I know from North America ever complained about the monsters like this, but I travel to Australia for visits so would make sense where I was unlucky enough to swallow something that caused such a misery