Pain in my knee and back thigh area

Patient: About a week ago my knee started to hurt, not the knee cap, but the muscles and like nerves all around the sides and the back. No swelling or redness..and I can hard walk as it is starting to hurt more. When i turn or twist even a bit it sends a sharp pain around the knee cap. Also the top part of my back leg hurts at times along with a pain in my right (same leg) hip. It feels more like a nerve but I am puzzled as I didn’t have an injury or fall. I am 62 and I have fibromyalgia and some OA. Thank you