The most important remedies for worry, stress and mood swings are making sure you're getting enough rest. So the first thing I'd suggest is enjoying a cup of chamomile tea each evening before going to bed.
There are many herbal supplements that can naturally relieve all your symptoms. If you'd like to try taking herbal supplements you can go to:
http://www.mynsp.com/grandmasherbs
Once there I'd suggest you take the Health Assessment. Once completed you'll see a list of different herbal supplements that you can safely take without the worry of getting over medicated or addicted to any drugs.