What Causes Severe Knee Pain Post Perimenopause?

Iam suffering knee pain since from Perimenopause period I had homeopath treatment since one year It ended up in one sided leg pain Now i had been to a bone specialist .I get my leg pain while sleeping suppose the pain is severe Iget my pain during walking also sometimes My physician suggested me to take flavojoint,EtovaP 400, roles D.But still pain is continuing to be.