My Stomach Is Making Continuous Growling Noises. What Can I Do?

A noisy stomach continuously for an hour, after eating.(rumbling gurgalling /no pain or discomfort ). Came on suddenly with an upper respiratory ailment. Took 10 days of amoxcicillin for that. Even had an abdominal CT scan , which showed nothing wrong, (the scan was done because I have hiatal umbilicus hernias, but the scan showed no leakage, blockage, or obstruction . My bowel movements are regular, sometimes I have gas, and get a kickback in my throat, when my stomachs making noises. I have tried probiotics, but they dont seem to help. All the doctors say my upper respiratory ailment was not associated with my Borborygmus, but I have my doubts, since both symptoms came about at the same time. I am hoping there are some simple tests, to determine the cause of this? But most doctors, although they say this condition is minor, recommend I get an EGD. So, do you have any thoughts on this suddenly appearing oddity? Can a urine or stool sample tell anything that the CT scan couldnt? Thanks