I have no suggestions but just wanted to say my cat is doing the exact same thing. It is driving me nuts. I am so close to dragging the damn couch out to the front verge for someone to take!

I find the feliway diffuser runs out very quickly as well and it's not cheap to refill either. My cat is 11 years old and vet checked for UTI which came back clear also. Totally feel your pain! xx