What causes abd distention, excess hunger even w/constipation despite high fiber/fluid intake. usually painless but extreme fatigue. no obstruction.

Start w/ evaluation: There are lots of reasons for abdominal bloating ; many are not due to the GI tract. Bowel "problems" often accompany GI disorders--whether functional or "organic." if pain with meals consider peptic (acid), biliary, or pancreatic disease. If bleeding or tenderness is present, this suggests inflammation, ischemia, or infection. "extreme fatigue" is quite concerning--thyroid, depression? See doctor.