6. Stomach Grumbling
Often, we associate our stomach rumbling with being hungry. However, this can actually be the result of numerous different things. In this case, your stomach grumbling might be the result of gas caused by fermenting milk. As the milk curdles and ferments and bacteria gathers, gas is created. This then attempts to escape through the stomach, causing movement and shifting as the air passes around foods.
If your stomach seems generally unsettled, then this might be a symptom of lactose intolerance, or potentially another form of intolerance (such as gluten).