Hello. I have been having stomach pain for about 7 months now. In the beginning i was constipated for about 3 weeks, and finally had black tarry stool. that is gone, however I still have severe abdominal pain. I had an endoscopy today but everything came back negative. The doctor suggested a endoscopy. What should I do? The pain is becoming unbearable but everything is showing that it is simply in my head.