I had some success as you have with one shot in the shoulder. The orthopedic cautioned me against doing any more because he said it will deteriorate the joint. The shot only worked about a week and then the pain was back. I also felt like that was not the answer since the pain was consuming most of my joints. The prednisone worked for me until the PMR burned out . That took about 6 months. I had some trouble stopping the prednisone at about 2mg but just weathered the storm. good luck