Balance, Serenity, Frankincense, Lavender, Cedarwood, Bergamot, Peace, and Vetiver all can help calm nerves and reduce anxious feelings. Each of these oils can be used alone, or you can combine them to fit your individual needs.
I'm particularly fond of Balance and Bergamot together, and I wear those two often on my diffuser necklace. Many others swear by Balance and Serenity, and Lavender and Vetiver is a wonderful choice for when you're having a hard time turning your mind off at night.
Apply a drop of the oil to the inside of your wrists, back of your neck, or bottoms of your feet. You can also use 3-6 drops in your diffuser, or just put a drop of oil in your hands, rub them together, and then inhale.
Disclaimer: One of the most important things to know about essential oils is that all essential oils are NOT created equally. Many of them are actually synthetic, with no therapeutic value for your health and wellness. When buying essential oils make sure they are certified pure therapeutic grade. If you want to order the brand I trust and personally use, email me: email@example.com