I understand the frustration you are feeling with PMR. I have experienced it myself. Prednisone brings relief and its horrible side effects!!
I tried methotrexate and threw up every day. Next was Leflunomide. It did not help the PMR and after 3-4 months I developed a horrible rash on my arms and torso. The itching was unbearable and it lasted six weeks. I am now on an Actemra infusion once a month. The third month the PMR pain was gone! I am still experiencing fatigue but blame that on possible long Covid. After four years I feel the most normal, not perfect, but I will take it!
Best wishes to you to find relief.