My breeder has some information on her website about Brachycephalic Obstructive Airway Syndrome. I'm just not sure if I'm allowed to post her web link here or not. If I was to screen shot the information it may take up pages LOL. She has worked with a University in understand and dealing with a lot of the bulldog issues. I'm not sure if your interested or not. Or if its of any help.
I'm so sorry to hear your little one is sick. Sounds like the meds are helping. Which is good.