Seems I might have something going on with my shoulder and arm that might be rotator cuff injury. It began last week and doesn't seem to be getting any better. It does get somewhat uncomfortable when riding. Without going to a doctor is there any way I can tell if it is really a rotator cuff injury or something else? Any type of exercises or techniques to minimise discomfort and promote healing? The pain comes and goes and I have lost full range of my arm when reach to scratch my lower back. Thanks.