Perhaps you have IBS:
http://www.aboutibs.org/
Another consideration is a peptic ulcer:
http://www.intelihealth.com/IH/ihtIH/WSIHW000/9339/10915.html
http://www.intelihealth.com/IH/ihtIH/WSIHW000/9339/10058.html
Have you been back to the gasteroenterologist (stomach specialist) to let him or her know of your symptoms since your surgery?
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