stress related gastrointestinal problems

I believe that my gastrointestinal problems which started few months ago are stress related. Is it possible? I am taking some meds but nothing helped in long term. Could I be right about stress and gastrointestinal problems connection?

There are a number of disturbances of the digestive tract that do not respond well to drug therapy such as irritable bowel, colitis, Crohn’s disease, and heartburn. When the symptoms are stress-related, which is possible using NLP or Time Line Therapy techniques can resolve the stress and result in a lessening of symptoms. If your problem is chronic, it is likely that a chronic stressor is a part of the cause whether that stress is from day-to-day life, or whether it is something nagging beneath the surface. It can be resolved with these techniques.