It doesn't matter HOW attentive you are; they are going to surprise you! that is one thing cats are VERY good at doing. You DID notice this, and you ARE taking action. You are doing fine as a meowmie!

I had to take Vita to the vet's this week for her sneezing. She has had URI's before. I have had other cats have it. I knew she has been sneezing. BUT I still didn't realize she had a cold and not just the odd sneeze now and then until she was sneezing non stop. It happens to all of us in part because cats are cats - they hide their illnesses quite well.

You won't need to rehome Paris, even if Paris is a part of the problem. There are many ways to address it. But the first step it to discover what is happening.

Let us know what the vet says!