13 years ago, I went to see my doctor after suffering from pain in my abdomen that went directly to the middle of my back, and the pain seemed to only come on at night. I told the doctor exactly what I just told you and because of my weight, he just assumed I was eating too quickly and not digesting my food properly. The pain I was feeling was akin to labor pain. All he did was tell me to slow down with my eating, even though I told him it took me over 20 minutes the night before to eat a hamburger alone. Finally, about two weeks later, after I couldn't take the pain anymore, I went to the hospital where they diagnosed me with having gall stones in my gall bladder. They even told me that the first signs of gall stones is pain going from your stomach to your back, which my own doctor refused to even care about when I told him myself.
Hope that might help anyone else here who might end up with gall stones and a crummy doctor.