It sounds like you are having gastrointestinal issues and irritable bowel syndrome (IBS) could explain your symptoms but it is a diagnosis of exclusion. The disease is characterized by abdominal pain and frequent episodes of diarrhea.
In terms of your eating habits, small portions high in fiber and low in fat and oil could aid your digestive symptoms and prevent you from getting hungry.
Probiotics can also help regulate your digestive system and are available by prescriptions. Many yogurts have probiotic additives but there is little evidence that the probiotics in yogurt improves IBS symptoms.
IBS is a fairly individualized condition and different people respond differently to treatment options. Therefore, an evaluation by your primary care physician or a gastroenterologist would be recommended to evaluate your symptoms and provide a treatment regimen that improves your symptoms and fits your lifestyle.
