Dear Sir/Madam
I have gone through your query and read your symptoms.
In my opinion, the surgery for the disc cannot lead to your abdominal complains, normally such things can have physical causes, which have been ruled out by by your gastro, moreover your gynae also has no such cause to put it on for your symptoms, to me it feels this could be due drugs, or psychological causes, are there any drugs you are using now, any type, then the second aspect you need to look at is your diet and exercise programme, diet with excess of fats, and
proteins can cause such symptoms, and lack of physical activity is another reason, now try this, for next 1 week, avoid all fatty and sweet cooked foods, take more of salads, and fruits, less of salt pepper non veg, and see the difference.
I hope that answers your query. If you want any more clarification, contact me back.
Thanks
Dr Narender Saini