Hello,

I'm currently working overseas (South Western China since February) and have been sick off and on for the past month. Usually I'm quite healthy, and have been very careful in terms of what I eat, not drinking water that hasn't been boiled (a concern in my area) and cleanliness.

My symptoms are pain and cramping in my mid section (from the bottom of my rib-cage and sternum to a bit below the top of my pelvis). I have repeated bouts of nausea, sometimes with actual vomiting, and the need to go which isn't always productive but is occasionally interrupted with diarrhea. I don't have a fever, but have gas. The symptoms seems worse at night, when I am lying down, or occasionally after I eat. I don't have much of an appetite, and the symptoms seem to come and go every couple of days. It also interferes with my sleep.

As I said, I am usually healthy, and have taken care to remain so. However, I am becoming more than a little nervous. I have seen local doctors and they usually prescribe amoxicillin and Nimodipine. My diet is bland, and I leave for home in Mid July. Is this serious, and does anyone have any idea what it is?