I don't know if you found an answer already but I am posting my experience to help out any other person. I had the same problem, burped 100 times a day, long dragging burps. Doctors did every test in the world on me, was taking anti acids, they went into my stomach to see If there was something causing my burping. They told me to stop eating pepper and tomatoes completely. One day I woke up and the burping ceased. After 8 months of everything and nothing worked, It suddenly just stopped. Ask me how, for three days, I traveled to a different state, and they delivered breakfast. I ate a heavy breakfast and the burping seized completely. I was shocked. I had always skipped breakfast now I know it truly is the most important meal of the day. I just couldn't believe something so simple as a heavy breakfast could solve my problem. Please if you are going through excessive burping and the doctors can't point to a specific thing causing it, try eating a heavy breakfast, it solved mine completely.