Cure for nerves. Anxiety is a normal part of being human, so there is no "cure". Many people can be taught ways to better manage their anxiety through cognitive and behaviorally oriented therapy. There are also anti-anxiety meds that are effective. You can be helped with psychiatric or psychological therapy.
Yes. With med and therapy.
Stay active. Exercise is a great way to relieve stress. Your body releases endorphins during exercise, which can help you feel calm. If you exercise 30 - 60 minutes a day, your stress levels can improve. When stressed, take 5 slow, deep breaths with your eyes closed, then roll your shoulders forward 5 times, then back 5 times. This will slow your heart rate and release tension in your neck and shoulders.