@imarino - I know the pain you have had. Extreme, especially after meals.
The ligament is pressing on the celiac artery that supplies blood to the intestines and some organs.
After a meal the intestines need an increase in blood supply in order to digest.
The pain has same reason as chest pain when the coronary arteries can’t supply enough blood to the heart muscle.
There is no specific diet for this, but I had less pain when I ate small and easily digested meals. Small, more frequent meals could help.
If you will need surgery you can find a surgeon with experience in MALS surgery. Mayo Clinic is a good choice.
Have you been losing weight?