Crohn's disease symptoms ?

According to the data you provided about your girlfriend (history of Crohn’s disease, abdominal pain, upper GI scope, colonoscopy abdominal ultrasound negative, feeling bloated after eating, nausea, vomiting, diarrhea), she may be experiencing symptoms related to Crohn’s disease.

Crohn’s disease is an inflammatory disease of the intestines. It is thought that it is an autoimmune disease, in which the body fights its own cells. The symptoms include: increased bowel movement, diarrhea, blood in stool (when the inflammation is at its peak), nausea and vomiting. Long-lasting Crohn’s disease might damage the intestinal mucosa and reduce the surface needed to absorb the nutrients. This might lead to malnutrition.

The treatment includes corticosteroids in order to reduce the inflammation. Antibiotics are given to treat the possible infections. If the person has severe diarrhea, the beneficial bacteria (that are commonly found in the intestines and are needed for proper digestion) might be washed out. This would prevent proper digestion and the food would produce more gasses which would distend the bowels and cause pain. Taking over-the-counter supplements that contain the beneficial bacteria (called probiotics) might help in easing the pain.