suffered from severe egg burps, headache, and vomiting, doctors couldn't figure out what was causing it. he kept a log of the foods that he had ate that and it turned out to be an allergy to Sesame oil and seasame seed, they are in terriyaki sauce, on top of some mc donalds burgers, on rolls, and very often in chinese food and sushi. I would suggest to anyone suffering from similar symptoms to keep a food diary and than ask your doctor to order some food allergy testing with ones you suspect or just avoid the foods. He's had no more egg burps since (thank goodness!) Good luck!