Hey Jane, I was thinking it could be your bones from possible osteoporosis. Between going throw menapause and are you taking steroids or anything that makes your bones brittle. Also have you been tested with a bone scanner to see if your bones are thinning? That is something most lupies - A/I women have done. If not you should probably tell your doctor you want it done. It only takes a few minutes.
Let us know what you do.
Each moment of life is a gift of God. psalms 39:4