Wow that's SCARY.
Second the idea of Toradol. Even better if you can slip Percocet back in as you may have had a strong reaction when anesthesia hadn't cleared your system.
Toradol can be alternated with Percocet. Both scripts are supposed to last 6 hours (ha!!). Take Percocet hour 1, Toradol hour 3, Percocet hour 6, Toradol hour 9, etc. Works pretty well for acute kidney stone pain so hopefully should work for post-surgery pain.