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Other good natural and safe remedies you may want to try is Rescue Remedy (flower essence), Calms Forte (homeopathic stress and tension formula), chamomile tea, hops, skullcap, catnip, and/or passion flower.
Other than internal remedies, you could also try aromatherapy- lavender is wonderful for stress and tension relief. Fresh flowers, especially roses, lilies, and lilacs can be very helpful. Don't forget about the wonders of bodywork- perhaps find time for a weekly massage, shiatsu, or acupuncture session.