I am an avid cyclist. One day Im ridimg 50 miles a day the next I can't get out of bed. I had a similar experience as you, except was diagnosed with PMR quickly. 15 mg was not enough for me. Doc worked with me to increase prednisone to 30mg.. 20 mg am and 10 mg pm. The relief was instant. I woke up pain free. Try it take more prednisone to get some relief. I am on Kevzara now and have gotten off of prednisone. I have some discomfort but so much better than those days of not being able to get up. Hang in there and work on getting med dose dialed in.