I'd start with the urologist, but also see if you can check back in with your pain doctor. Perhaps this is a spread of the CRPS into the bladder (which is frequently affected in long term patients) and perhaps the uro along with the pain doc can help figure out some help. Do you use lidocaine during the cath change? (Hubby has SP due to MS) I know it can be common to get some bladder spasm during the change, do you take any anti-spasmodics for the bladder already?