Difficult case given the history of recontruction. I am not aware of controlled studies that can help esophageal spasm in these cases.
Traditional approaches, such as anti-spasmodics such as a Levsin or Bentyl can help. They are normally used in the area of irritable bowel disease, but you may want to discuss whether they can be applicable in your case.
If a lack of motility is found to be the cause (and can be evaluated via esophageal motility studies), motility agents such as Reglan can then be considered.
The key is determining whether your symptoms are caused by spasm or a lack of motility.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.