My husband had a colonoscopy and endoscopy recently and the dr. opened a tightening of the espophgus. Tonight at dinner he had difficulty swallowing and as if food was stuck. Pain in the back between shoulder blades. Eventually he belched enough to bring up some foam and clear stringy mucous. Any thoughts as to what is going on, he has a follow up appointment in August. This happens about once a month, this was first time since procedure that it was this bad.