The SSRI anti-depressants are also very helpful for anxiety. A natural substance for mild anxiety or sleeplessness is a Valerian Complex, which contains Valerian Root, Kava Kava, Chamomile, and passion flower. Kava Kava is also sold as a single product and has been used for centuries in some cultures. Relaxation and visualization exercises can be very useful in reducing anxiety and worry. There are many available in most book stores.
Caffeine is a stimulant.
If you are drinking more than 2 or 3 cups of coffee a day, it can increase your nervousness. Do not drink alcohol right before bed. While it may help you relax initially, it increases restlessness during sleep and you will not get a good night's rest. A gratefulness journal can be purchased or created from a notebook. Make a habit of writing in it every day.