Nervousness, sweating and vibrating are due heightened sympathetic nervous system activity. Anxiety can cause these symptoms. Try these life style modification: Eliminatine caffeine, start an exercise program, improve your diet, and get support from family and friends. Try some relaxation techniques like Yoga, meditation, and deep breathing exercises. Dealing with worries is also one technique; like learning postponing worries, and learning to accept uncertainty in your life. If nothing works there are some medications which reduce sympathetic activity, like propranolol. Best wishes, Dr. Jagdish