The bone would usually show up on the x-ray so as your x-Ray is clear then the bone probably has gone. The symptoms you are experiencing are likely to be due to the trauma it caused when you swallowed it. There will have been some irritation and inflammation of the esophagus
. This would account for pain in the first week or so but as your symptoms are still present after 3 weeks, I suggest you see a doctor as there is a possibility that the bone may have punctured the esophagus and infection may have set in. If this is the case, you would need antibiotics.
I hope this is of help to you.
Dr K A Pottinger,