Is it normal with BFS to experience alot of trembling in my body when I move or try to hold my body in a certain position. I notice it all the time, and it always translates to my brain "weakness". Makes me feel like a trembling 90 year old lady. And if I get caught off gard by a load noise or something, my whole body just startes shaking, What is that?? And is all this normal for BFS??