When we first took little Kitten home he was the definition of "scardy cat". Everything frightened him, which was sometimes funny but mostly just sad. He ran from sounds like a phone ringing, movements like me walking into a room and new people. I was concerned that he was SO high anxiety but after a few weeks he calmed down...and then we had family visit. The whole process started again. Poor kitty! Our vet gave us an herbal supplement called "Animal Relief Formula" it is a blend of flower essences that have a calming effect on cats and dogs. It is natural, safe and impossible to overdose. All you have to do is put a little in their water bowl and it helps to keep them calm during anxious times. This has been great when we have visitors or during times when he becomes super high strung for no apparent reason.
I hope this helps you with just a few of the important choices we make for our pets. When I think of how much joy and love this little kitty brings to my life I know I am doing the right thing. Just like with anything else we learned through trial and error I included some resources for you if you want to do more research on your own.