my grand mother is 73yr old.the muscle of her lower abdomen trembles vigorously with a rolling movement.as a result the whole lower part of her body shakes including legs for which she cant walk properly,neither can sit for too long.only when she lies on bed she feels relieved.but when she sleeps soundly her trembling stops totally.she has been suffering this for quite a few months now.she takes neuro medicines but nothing seems to work.WHAT DISEASE IS THIS?PLS SUGGEST ANY MEDICINE FOR COMPLETE CURE.