Sure.and.thanks. I Was A Perfectly Healthy 57 Yr.old.man. Went To.gym

Sure.and.thanks. I was a perfectly healthy 57 yr.old.man. Went to.gym 4.days per.week and no health problems.whatsoever. Went in for routine colonoscopy and 4.days letter became.violently ill. Headache nausea chills night sweats stomach pain loss of appetite and terrible stomach about 2 hrs after eating. The gas is awful and constant
About a week later they ordered.endoscopy and diagnosed with chronic gastritis. Probitoics are not helping. They did biopsies that came back negatibe for cancer and hy pilori bacteria. I have zero history of any abdominal issues and never had beartburnnor acid reflux. This isnt going away any thoughts?