do you smoke? sleep very less? do you exercise? I also have those body shaking problem, especially when smoking then i will begin to shivering, shaking while standing. And Chronic Fatigue Syndrome also will cause you shaking. So my advise is, healthier life style like exercise daily, get enough sleep, balance diet and stop smoking. Thats what i'm doing now, it will dramatically reduce the problem, at least it work for me.