My two year old burps a lot and complains of stomach pain. She is irritable the majority of the time, and sometimes presents this irritability with behavioral issues (biting, hitting, pinching) regardless of the consequence (time out). She will wake up screaming in the middle of the night and complain of stomach pain, and I can hear her stomach rumbling. She sounds like she is possibly reswallowing at times. When she does burp, it could be several hours after she has eaten.