I have a friend in Florida, treated at the Moffitt Cancer Hospital (he had a lung and a kidney removed some 6 yrs ago) who recently had kidney stones. As he only has one kidney his doctors said surgery was too dangerous. He had two procedures of lithotripsy, where they shattered the stones into small pieces and he passed them painlessly. He had stents put in twice, and then removed You rellay need to see a urologist who knows what they are doing, preferably at a major medical cente allied to a university.
I have had Crohn's for some 37 yrs and have never heard of stones being caused by Crohn's, but guess anything can happen. Have you insurance? I don't think the ER doctors can do this procedure, you need a specialist Urologist.
Take care and hope you get it sorted out soon.