Brief Answer: Air swallowing can be the reason. Detailed Answer: Hello! Thank you for the query. Excessive belching is called aerophagia. Due to air swallowing, you get this symptom. Air swallowing can be caused by chewing gum, smoking, eating too fast, loose dentures, drinking carbonated drinks. In rare cases belching can be a sign of some stomach, esophagus or other abdominal organs issues. I suggest you to try to eliminate mentioned factors first. If this wont help, you should consult your doctor and have some diagnostics. Abdominal ultrasound and gastroscopy should be done. another possibility is UTI due to tampoon you have left inside, so get urine culture report Hope this will help. Feel free to ask further questions. Regards.