Here's an idea so you don't have to worry about diffusers and all that stuff....

I have one cat who uses Feliway - my vet ok'd it instead of a medication. He was wild his first 2 - 3 years, and even good stress affected his health via a urine infection.

Spraying it in his favourite areas...there were a lot of them. I tried spraying a bit of rag which I would lay beside him - but he would get up and move, of course, and not get the 4 hours exposure.

So - I got a stretchy collar that comes off instantly if he and his brother are playing hard(don't get the breakaway), and I shake the Feliway bottle and squirt a tiny bit into his collar (don't put on fur or skin).

My vet LOVED the Feliway Collar idea and has recommended it to other clients.

Maybe she would let Hubby put a collar on her?