Hello and welcome to Pet Talk!! I know what a frustrating circumstance that this is and can totally relate. My cat Scooter has this very same problem. We've spent hundreds of dollars on countless vet visits. He has had serious UTI, but even when he's completely healthy, we can't trust him to have free run of the house without supervision. He has a behavioral problem, and our vet said there is basically nothing we can do to 'fix' it. We can only 'prevent' it.
We did try the valium for awhile, and there was another drug that we were offered (ovaban), but we refused as the repurcussions could be very serious. Currently, we have a 'kitty playpen' that Scooter is in when we are away from the house or sleeping. It's a two level enclosure that's big enough to fit his large covered litter box, food, water and sleeping spaces. I got it from Drs Foster and Smith. You may want to give this a try if all else fails...such was the case with our Scooter.
Out of curiosity, is your cat declawed?
Good luck and let us know if you find a solution!
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