I am in my early 60s. For the last three months, after dinner, I feel indigestion for 2 hours and have a crampy stomach with lots of belchings. Because of this, I am not on regular food. Earlier, I had a few issues, but that was manageable and not so intense. Now, even when not taking food, I get belching and wake up in the middle of night. I had gallbladder removal around 20 years back. When I visited a doctor, he advised for endoscopy and colonoscopy. Both the results were good. Why then the cramp and belching did not go off? Incidentally, I had a reducible right groin inguinal hernia before three months. I feel very anxious with my heath problem. Can you tell the reason for crampy stomach and belching when the scope tests are clear?