So sorry to hear about your dog getting this awful thing. It was 8 years ago, but I went thru a Canadian pharmacy to get the name brand Sporonox & had no problems with it. Mine came in packaging with several different languages so I don't remember where it was actually made, Germany or India, maybe.
There's a lot of information on this board & I don't know how much you've had a chance to read, but most people have seen their dogs get worse before getting better, especially coughing. Seems like as the meds kill the fungus, it makes breathing harder for a while before the dog's system starts to absorb the dead fungus. Also, the meds that kill Blasto, unfortunately, can cause lack of appetite. Since it does take a little bit for the meds to build up in the dog's system, it could be coincidental that her eating habits changed with the change from US to UK meds.
Good luck with your dog! Harley & I will keep positive thoughts for her.