IBS Irritable Bowel Syndrome is VERY common. Your digestive tract's neurology is at least as complex as your spinal cord. It could be described as our second brain. When the communication between these two brains gets fucked up you notice things in your gut more, IBS. That's the current thinking from what I know. See you doctor and ask about low dose tricyclic antidepressants as treatment.
That's all I'm going to get into on this because this stuff makes my brains hurt.