I called my urologist and scheduled the Botox procedure for next week. As it turns out, I won't be getting it in the bladder detrusor, but in the, uh, pee schincter (just now, I can't remember what you call that gizmo). The immobilization of the bladder detrusor is for those who are self-catheterizing, because you can't pee without the detrusor. I'll be getting the sphincter muscle immobilized, which won't do anything to stop the detrusor spasms that send me running for the potty. What it will do is stop my pee sphincter from closing up when I try to get my detrusor to contract, permitting me to empty properly.
I need to get clearance from the HMO, but the urology department reports they haven't had any trouble getting my HMO to pay.