Rescue Remedy. It's flower essences and a good bit of alcohol. Put 3-4 drops under your tongue and it has a great calming effect. I use it myself every so often if I can't sleep or I use it on my rats if they are having breathing problems and are panicky. Works great. It's around $20 for the 20ml bottle, but worth it.

You can get it online or at an organic food store sometimes.

http://www.bachflower.com/