I had zero ankle pain before Letrozole. There was no change in my activity from before I took it to after. My ankles started hurting three days after I started taking it. I've never had bone or joint pain before. My pain level seems unrelated to my activity. So far whether I walk or not, do my exercise class or not, it neither triggers or lessens it. At this stage anyway. It's only been three weeks. It's just weird to me that the night before the pain was low level, but last night it was bordering on excruciating. Same temp, shorter walk. The osteo paracetemol helped.
There's no choice here so I'll just have to ride it out and hope that it settles. But I reserve the right to whinge!