question: Last night i went to sit down on a bed close to the ground and eded up hitting the middle of my spine all the way down the wall.i also had a shirt on that had a belt that snaps together in the back right on the part i fell on.so now theres two decent sized knots directly on my spine.im slso experincing some numbness in the back of my arms as well as the back of my theighs,which is making me nervous.should i be concerned?