I have had weakness and pain in both legs. After sitting for a half an hour or more, when I get up I have lots of pain in both legs and can hardly move. After standing for little while then with pain can begin to walk. One day when I had been sitting at the table writing for about forty-five minutes or more, then started to get up, I had this terrible pain right above the right knee (I hadn t had that kind of pain before). When I started to walk into the other room, the pain came again and almost fell down. I have to be careful walking.