I'm sorry to hear that your father is in pain. Have the doctors discussed the possibility that he may have gallstones or pancreatitis? I had some pancreatitis after part of my pancreas was removed in 2002, but after a few months it went away. Pancreatitis occurs when your digestive enzymes start eating away at the pancreas itself when it is not working properly. It can be caused by tumors, gallstones or bad diet. When I did have pain, I had to lay down and wait for it to go away. It also helped to not eat fatty foods or food that was difficult to digest. I didn't have a burning feeling, though, so it may not be the same thing. I did read on the internet that there is a medicine that can be taken with food to help with digestion which may help to prevent the pain. Check with his doctors. I will check on how you could order the Ambrotose as well.