rocket, The surgery may not be the answer. If you remove a healthy organ, it could have a negative impact on your digestion, and cause your Crohn's to flare. You might visit your health food store, and try some enzymes with bile and some herbal stone buster or stone free product, in case it is your GB, and just not inflamed enough yet to see on a CT. My daughters co worker avoided surgery this way. Crohn's sometimes causes unexplainable residual pain. I had stabbing chest wall pain, long after my Dr's proclaimed my remission.
My scope from two days ago showed a normal healthy gut. I still have the rib, chest, and shoulder pain. I think this is the residual pain I mentioned. Family members who have had various surgeries tell me it takes time for the nerves to heal from inflammation. This is more painful than I would have expected. Hope you are feeling better.