Just found this, might help, its taken from another site.
I would 100% recommend Rescue Remedy.
Freeway was very nervous and timid when she first came to live with us. I religiously put Rescue Remedy in her water every day, and she relaxed and settled in extremely quickly.
Even now, I adminster some if I know we are going into a situation that Freeway will find stressful.
For a general feeling of calm, I would recommend that you add 6 drops to Millie's water bowl or to her food every day. If you are going to be facing a stressful situation, then give Millie 4 drops on a little piece of bread or a treat.