Have you had MRI done since the accident. It is possible you may want to look into any possible spinal cord trauma, if it is there you want to be checked regularly to monitor the progress. If it shows nothing now and the pain continues it doesn't mean that there may not be injury to the spinal cord as it can take years for it to actually show up. Is this pain radiating from the spine area out, is it a deep sensation, almost feels like you want to pull on your ribs to stretch it? Can you explain a little more in detail what you are feeling?
Yes been there and sounds like a cracked rib, the pain killers you were on masked the pain your now getting, but should start going away very soon, if not get your doctor to give some pain killers for it, when I had mine I was put on some real good s**t kickers by doc UK doctor.
Good Luck