For some time now I have a symptom that I can only describe as muscle "ratcheting" or "cog wheeling". I'll give an example - If I move, lets say, my shoulders up and then down, during movement there will be some sort of resistance that will create a tremor/shaky movement in my muscle. It affects most, if not all of the muscles groups in my body so it must be a neurological problem? There is no tremor if my muscles are at rest.
Any information as to what's causing this would be great.