Sorry, I'm not much help here, but am also seeking answers.
i have the same issue. I have found a little bit of an answer and will probably take it to my doctor.
taken from wikipedia..
http://en.wikipedia.org/wiki/Globus_pharyngis
A less common cause, distinguished by a "lump in the throat" accompanied with clicking sensation and considerable pain when swallowing, may be due to thyroid-cartilage rubbing against anomalous asymmetrical laryngeal anatomy e.g. the superior cornu abrading against the thyroid lamina,[4][5] surgically trimming the offending thyroid-cartilage provides immediate relief in all cases.[1] However this cause is frequently misdiagnosed, despite requiring a simple clinical examination involving careful palpation of the neck side to side which elicits the same click sensation (laryngeal crepitus) and pain as when swallowing, most cases are due to prior trauma to the neck.[1] High resolution computed tomographic (CT) or MRI scan of the larynx is usually required to fully understand the anomalous laryngeal anatomy. Anterior displacement the thyroid ala on the affected side while swallowing can help resolve symptoms.