Sorry to hear your Hawk got this nasty thing. I'm not sure how many posts you've had a chance to read on this board, but there's a lot of good anecdotal information from other owners who've gone thru this already. Unfortunately with the breathing difficulties, a lot of dogs seem to get worse before getting better. Most seem to think that as the meds starting working, the dying fungi act like debris in the dog's lungs. The dog's system will eventually absorb the dead fungi, but until then, it makes breathing harder. My Harley didn't really have much breathing problems, but I've seen some people post that they put a small fan on their dogs to keep air moving & help them breathe.
Good luck with Hawk. Will be keeping you both in my thoughts:)