Same thing happened to me
My youngest son was using whey protein and ended up with a kidney stone too. I took 50,000 IU of Vitamin D once a week at my endocrinologist's direction, and after some years, he ended up taking me off of it because my numbers were too high. I have an over-active para-thyroid too, that produces more calcium than my body needs. The number for that is always high. Sucks to get old.