Holy smoking gun batman.Yes I suspect this surgery will help tremendously with your pain. If it was delayed long you should have been on a calcium lowering agent, though likely a little late to start now.
My calcium bounces between 11.5 and 13.5. I have surgery to remove the overactive parathyroid glands at the end of next month. It was supposed to be this month but the hospital broke a needed machine the day before it.I will have to looked into the nephrocalcinosis, I haven't heard of it before.