Yes, I have this terrible pain also. It mostly starts at night, and I thought, that it was connected to food, I ate for supper. So now I am hardly eaten dinners anymore. The pain lately was so bad, that my Primary Doc thought, it might be pancreatis and is sending me back to my GI. But I had CT scans, while in the ER, and it does not show anything.
I also have a lot of headaches, and pressures. I do not know anymore, what to do. Have not received any real help from the medical field.

@edda Just a thought about this. Sounds to me like some sort of slowly progressing disease. I have LiteChain Amyloidosis, and it has grown so slowly that doctors have given up just waiting for it to do something. Most protein-related disorders act this way. Might have your doc order a SERUM FreeLite(C) Protein Assay and a 24hour urine protein assay. A sFLC figure above about 1.4 mg/dL, or a 24-hour above 0.5 G/Day are signs of trouble. It is quick and cheap. Have ARUP or Quant test them. Amyloidosis starts with a single atom at conception, and doubles every few hours, but usually only reaches noticeable stages at about the age of 50 or so.