For the past two nights, in the middle of the night, I wake up with severe stomach pains. They are not associated with diarrhea. Last night, the pain was so bad I pondered going to the hospital. Saturday night I ate early (6-6:30). Sunday night, I ate little all day, and had a small beef and rice dish from Pei Wei about 8. It does not hurt at any other time of the time, eating or not eating...just at night. I do not have problems with reflux. What could it be?