I saw my oncologist a month after stopping Anastrozole. Of course I had called him when I had the awful knee problems. He said to stop them. I had already stopped them when I could not even get out of bed. It didn't last long but it scared me. So on my next visit he said any other med would likely cause the same side effects. So I've been off Anastrozole now for almost 6 months. My onco will continue to follow me. I will see him again in January.
Good luck to you.