Some are transitioning from Prolia safely with Reclast. The multiple fracture rebound effect of Prolia should be monitored for two years with bone markers.
Reclast (zoledonate) has it's own set of hazards, but is the most recommended exit strategy from Prolia. You could alternately take Fosamax (alendronate) . Reclast is a yearly injection, Fosamax a daily pill.
Bone loss six months after the Prolia injection is rapid.
When are you due for another injection?
I agree with your assessment of the drug, and think that you should transition off Prolia. But you can't be shamed for trusting your physician.