9 months post nissen fundo. major rumbling, gas, bloat. is lactose intolerence a side effect to this surgery? test for lactose intolerance?

Lactose intolerance: Lactose intolerance is hereditary but can occur if the small intestine becomes diseased or injured. I don't believe that your procedure, which improves the esophageal sphincter, fits in this category. To check for lactose intolerance you could try an elimination diet or undergo the actual testing procedure. A gastroenterologist can advise you further.