Angie. firstly I am so sory to hear everything is not going too well just now, we are here if you need us.
We have had two bunnies with serious nasal blockages recently, and in addition to antibiotics, I have tried the following regime to good effect:
One drop of Echnicacea three days in a day in a little water.(to help boost immune system)
New Era Sinus formula tablets. combination Q (I think) four tablets dissolved in a tiny drop water three times a day.
This treatment has turned one of our bunnies around, that even the vet had almost given up on...and she is now recommending it to any other Clients with similar sinus problems in bunnies
I have two bunnies on the above regime, and they have been on it for six weeks now, and we seem to be getting further than on antibiotics alone.
Love Adele
NB dont give echinacea at same time as the New Era tablets, as the New Era tablets need to be dissolved in water only, and given before food and not with any other strong flavoured fluids.