Received a cortisone shot today on my right knee for a torn ligament 3 months ago. Knee was alot better with physical therapy last appt with dr today. Stated a cortisone shot will releive the rest of the swelling in my knee and gave me the shot. Knee feels like when I first hurt it, but worse. Can’t stand, walk, straighten or bend right leg. I am icing it. Is this pain normal? How long does this last?