Hi. Usually there are no diseases concerning he left lower abdominal pain associated with the pain you described by any anatomical connections. Yet if the Doctor has said so , the only thing I can assume is gaseous distension with volvulus of sigmoid colon to become big enough o cause pressure and pain in the upper abdomen and the additional symptoms. A rare reason can be attributed to the spinal condition casing this combination of pains unless there are two different diseases. I would advise to Have a MRI of the spine, Standing x-ray of abdomen during the pain in abdomen and ultrasonography to rule out other intra-abdominal pathology.