6yr old with stomach pain, diarreha, and vomiting like once a week! doc didn't say much been going on for over a month! what would cause this im worried?

Keep a journal: There are a lot of possibilities from a simple food intolerance to something more serious with her GI tract. I recommend you keep a daily symptom journal. Include what your daughter eats, if she has abdominal pain or vomiting and what her stools are like. This may reveal a pattern and will give your doctor more information to figure this out. Weight loss can indicate a bigger problem so watch that.