I'm having very immense kidney pain from a cystoscopy with left retrograde. the percocets aren't working. if i go to the er what would they do?

See below: They will probably check for UTI (urinalysis) and check blood work, as well as a renal us or possibly ct to see if your kidney is swollen (aka hydronephrosis). Transient ureteral obstruction related to internal swelling can occur from time to time after procedures such as the one you had. It typically improves within 24-48 hours with hydration and pain control. Good luck!