Hi. Thanks for your query. This is a rare problem which I heard of. There has to be a cause for this feeling of stomach ache if you use anything tight. There is a history of anti-reflux surgery in past but may not be related to this symptom. I would advise you the following: Consult a Neurologist for clinical evaluation, actual physical examination to see if this can be related to any problem in the spine like prolapsed disc pressing upon the spinal cord. Get an MRI of the whole spine. Consult a General Surgeon to see if there is a local cause like an inflammatory process still going on in the abdomen. Further treatment will depend upon the findings of the Specialist Doctors and the reports of the investigations . I hope we can get one reason which is treatable and cured.