(Concern..) Knee. Ankle pain

I am currently undergoing treatment and taking hormone medication.

Of course, I am also undergoing other treatments at the same time.

They say that the bones have become quite weak...

I experience some knee or ankle pain when I walk, though it's not very severe.

Maybe I feel like I've become a grandmother..ㅠ

But is lying down and resting helpful?

Should I exercise by walking little by little to get better?

But the professor can be sick.

He says I should do moderate exercise...

Since I'm feeling unwell, I have some gloomy days ㅠ