I would agree that the fluke diagnosis appears to match the evidence, could be a combination of a skin fluke (causing skin cloudiness and hemorrhaging) and a gill fluke (affecting breathing).
There are many different types of flukes (a fish disease book I have claims ~1500), most of which have a narrow host range in nature. This would explain why only your angelfish appear to have been affected.
I've had battles with flukes in the past, and they can be very resistant. As others have said, first of all, treatment in a QT is required. The use of a QT can also give you a range of treatment options, from the usual prolonged immersion treatment listed on the medicine bottles, or short-term baths (say 30 minutes to 3 hours) with more concentrated dosages of medications. I would recommend the book Fish Diseases by Edward Noga if you want to learn more about disease and treatment.
The effort to catch the Queen Angel for transfer to a QT, even if it means partially dismantling the tank, will give the fish the best chance. A word of caution on setting up a rush QT ... aim to do 25% water changes daily until the biological cycle is established, and really monitor the ammonia level (it can spike within a day and kill --- so have some de-toxifier on hand such as Amquel). Personally, I believe ammonia is the largest cause of death for fish in QT, from my own experience as well, unfortunately.
I would start with prazipro, and next go with formalin if the situation does not improve.
Flukes can double in as little as 24 hours ... good luck in saving the queen.
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