Yesterday I fell from my skateboard, wasn t wearing a helmet, and fell on my back hitting my head on the ground. My head doesn t hurt, only lightly where it smacked the ground but today my whole body hurts, my muscles and my neck is stiff. Is this a sign of a concussion? Other then that I do not experience the symptoms I ve read, I m not dizzy, I talk, walk and act fine, I m not feeling confused...