I had a Rocephin injection on September 5, 2014 for Strep Throat and have had TERRIBLE pain in low back at L4-L5, sacrum, coccyx, across the top of the hips and some pain radiating into the top if my right leg. I have tried chiropractic care and massage therapy with only very slight short term (a day or so) relief. I understand back pain after a Rocephin injection is common, but how long should this last?