Valerian works in a similar way to rx sedative/antianxiety drugs, although at a different binding site on the GABAa receptor complex, but its no knockout or heavy duty stuff, pretty gentle, and I don't see it being addictive.
Another option is lemon balm tea, chamomile tea again is another (although I don't like chamomile tea myself, I don't like the taste. The balm on the other hand, is delicious,. sweetened with honey. You can probably buy it online dried, although fresh is best of all.
I'd grab some seeds too, it is REALLY easy to grow.One of the mint family, they grow fast, my tiny plants I'd begged from the daughter of somebody who planted a public herb garden took off like a rocket, now several feet tall, big busy things.
It isn't really a sedative, but good for soothing frazzled nerves, and has a relaxing effect. Chamomile tea especially is even ok for kids.
Hope some of this helps you miss K.