Hello, about two years or so ago I injured my neck (instant bruise on my spine), and my left shoulder blade (raised up). As time went on, the bruise went away and my shoulder went back to normal. I've still had constant headaches, but lately, what started sporadically, has increased: when I cough, as well as just sometimes out of nowhere I lose control/feeling of my left arm. What could this be? Nerve damage? I don't see my doctor until next month and am just very curious. Thanks, Anthony.