Amp180 I have had that problem for many, many years and got the same diagnosis as you did. The doc put me on Omeprazole, but it does not help those attacks. I am still wondering if it is my pancreas . I was told years ago at Mayo Clinic to have two tests run on my pancreas while I was having an attack. I never did, because they usually came in the middle of the night then and I hated to make my husband get up and take me to the ER to have it done. I recently had 12 inches of my colon removed and now the attacks are much shorter and less painful, but the bowel surgery caused me to have diarrhea all the time. I had diverticulitis and IBS and was in bad pain a lot. Now I don't have that pain at least.
I hope you find a solution to this problem. I don't travel without my heating pad. It seems to help when I put it on my back and lay down, but not flat down. I use pillow props.