My girlfriend has kidney disease her's is called megellary sponge kidney...there's a ton of different kinds. Her's means she gets a ton of stones and in general has pain for no reason that kinda thing.
The thing with something chronic like that is the ER won't be very helpful, it's really painful and they're all now on watch to not give pain meds so they'll give nothing other than light stuff and discharge you in the same condition you entered in. If you end up in and out a lot which she has at times they'll get to the point of giving you nothing because they'll claim you are drug seeking even when you have a real condition.
Medical care is total ass in this country.