I don't have cats but once lived with a very neurotic little cat, the feliway diffuser mentioned above made a huge difference for her.

I'd also suggest a second opinion, I have a dog and I know they're different but excessive urination tells me kidneys, bladder infection, or diabetes. A complete blood panel would point the vet in the right direction

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Modified CG since Dec 2011
Growing out super short cut

High porosity, fine, unknown curl type, somewhere in the 2s at the moment
Mostly low poo
Current rotation includes:
Wash: Yes To Carrots -Condition: Yes to Cucumber, Nature's Gate Jojoba, One C - Stylers: Deva volumizing foam, Deva UDG B'Leave In, Foxy Curls Hi-Def Curl spray