I had surgery 13 years ago for a hernia. I got cut above my navel. Could this hernia have come back and making me have a lot of gas discomfort.

Possible not likely. Hernias usually cause symptoms of pain and tenderness with a localized area of fullness. While it is possible for a hernia to recur this does not sound like that is occurring in this instance but, of course, you need to be examined with the possible use of diagnostic imaging.