Aggie,
Twists can be very difficult to diagnose and tiny hernias can too...they did every exam in the book on me, MRI, Cat Scan, x-rays, opacification etc but nothing showed until my surgeon went in through laporoscopy and saw the hernia himself... and fixed it...he did mesh and it worked quite well...after all of the major surgery for the smallest problem it was nice to have a minor surgery for a major one...do not let them give up until they find what is wrong.
Sharon