Sorry. We had PHI, so not much help there. DS was the same. He developed Apnoea to the point that I co slept until the surgery as I was so worried.
I am not sure how much it would be full cost. You would need to discuss with surgeon.
You would be looking at surgeon, and possible surgeon assistant fee, anesthetist fee, and hospital fee, as you would most likely need to stay overnight

Surely if they thought t that bad, they would bump you to an urgent status for public?!