I've just got back from taking Gypsy to the vets and it seems that she has CT. The vet isn't overly concerned at the minute because I can control her breathing when she does it and the vet said that the way I've been doing it is right and that if that's working for her then I should carry it on without medication. She only does it when I get back after leaving her for a few hours or when people come over and she gets too excited... so hopefully we'll be able to get away with not relying on medication for a while untill it gets worse.
Poor little Gypsy!