ive been taking prednisone for 2 doses..(2 days0 my legs were so ...

ive been taking prednisone for 2 doses..(2 days0 my legs were so sore when i woke up the first day i could barely stand i did do a little running around i am 28. but nothing that would have caused this.its painful to sit because it causes them to get stiff. it hurts to walk because it causes them to have to straighten out. its a catch 22. i cant call my doctor until Monday. so i don't know what else to do. no matter what i cant stop taking them im told.so i have no idea what to do. im in so much pain i cant barley do anything.