My girlfriend is experiencing abdominal pain (generalized) (worsened by: after meal) (severity: moderate) (quality: throbbing sensation) , nausea (severity: severe) , stomach cramps (quality: cramping in lower abdomen) , diarrhea (quality: severe) and b

There are many: possible causes for the symptoms you are expressing. You need to see a health care provider for evaluation as soon as possible.

Ignore no symptoms: Abdominal discomfort of any kind is not to be ignored--its a warning sign that something may be wrong inside your abdomen. Please see my many healthtap answers on the subject of what causes abdominal pain. Not all such problems are serious, but you don't want to miss the problem that is. Your described constellation and severity of her symptoms may or may not be related. Get her checked please.