What Causes Shoulder Pain After Discontinuing Prednisone For Polymyalgia Rheumatica?

I have had 2 bouts of Polymyalgia Rheumatica and treated it with Prednisone .I did not have any pain while I was on prednisone but when I tapered off I started to get shoulder pain, mostly at night and in my right shoulder but sometimes in both shoulders. It does ease when I sleep in a recliner. The pain usually does not get bad until about 4 hours into my sleep and then it disturbs my sleep considerably. I have not used the shoulder excessively. It does not bother me much during the day and does bother me when I play golf. Also my middle finger on both hands gets very painful when the shoulders are at their worst.