I have same issue. Just found out I have mtfhr gene defect which is methylation issue that impacts the digestive system. It could be sluggish gallbladder that isn’t producing enough bile which works as detergent to break down food. Or it could also be the stomach valve or illiocecal valve that remains open and doesn’t shut all the way so all the undigested food gases back up. I started taking ox bile supplements and digestive enzymes. I might have ulcer so I’m going to doctor today to set up endoscopy. Also do you guys have burning sensation in stomach when it’s empty? I also get dry mouth and that acid build up in throat.