Thanks for writing to H.C.M. for your query.
I have gone through your query regarding feeling of some pinching pain
in throat during swallowing and clicking sound as well. Your history of suspected fish bone swallowing is two years old. Though on endoscopic examination no fish bone is identified.
If still you have any doubt than I think M.R.I.neck will be perfect investigation to rule out fish bone and if any other pathology is going on that will also come in view.