You're constipated. Constipation can occur when not eating enough fiber-rich whole grains, fruits, and veggies, which stimulate digestion. Adults need between 25 and 30 grams of fiber a day, says Dr. Lee. Best foods: High-fiber whole grain breads, nuts, beans, prunes, oatmeal, flaxseed, broccoli, pears, and apples.
A stomach rumble, also known as a bowel sound or peristaltic sound, is a rumbling, growling or gurgling noise produced by movement of the contents of the gastro-intestinal tract as they are propelled through the small intestine by a series of muscle contractions called peristalsis.
Goal is to clear out anything that remains behind, so this can cause loud stomach gurgling sounds. However, important is to know that also an upset stomach and irritable bowel syndrome can cause stomach noises as you reported. Sipping some warm 7-Up, sneaking a snack and stop gulping might prevent those sounds.