Acute polymyalgia, limiting ADL

Patient: I have been taking Prednisone (weaning from 20 mg, now at 15mg) for acute polymyalgia…symptoms are returning. Blood work shows elevated CRP of 81, rheumatoid factor is slightly elevated as well. What other diagnosis could I be dealing with? Previously very active (biking, yoga, golf, working out at the gym regularly) I cannot do a push up now as my arms are so sore, hips aching, neck feels sore too.