It's from a combination of gas and irritation to your diaphragm/surgery. I know how painful and annoying it is. If you can get walking, it can lessen the pain.
Hang in there,
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”