Welcome @amvp, I imagine you will probably get your answer with the blood test results tomorrow. There are quite a few conditions that have symptoms similar to PMR and normally the definitive diagnosis that you have PMR is the pain will go away when you are on the correct dose of the steroids. I did have some hand pain with both occurrences of my PMR but don't remember it being a stabbing pain. There is another similar discussion you might find helpful:
--- Is it PMR (and/) or Osteoarthritis?: https://connect.mayoclinic.org/discussion/is-it-pmr-and-or-osteoarthritis/