Persistent abdominal pain

My husband has had abdominal pain on the left side radiating to the back off and on for a year and a half. Now the pain is constant and severe. He also has blood in the stool, and occasional indegestion. All tests continue to come back negative - colonoscopy, endoscopy, CT, bloodwork, etc. Anyone had something similar or have any ideas? We are desperate for a solution. Thanks
 
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