answer:I am not a doctor. I had gallbladder disease that presented as pain between my shoulder blades. Sometimes it was a dull ache, like i needed a massage or a chiropractor. Other times it felt like I was being stabbed in the back. Once this happened a few weeks of serious upset stomach, increased belching, indigestion, vomiting stomach acid… I’d eat an almost zero fat diet for a while, then ease back into regular foods. Eventually I had the bastard yanked out. Four years later I still can’t eat too much fat in one sitting without indigestion. At least the stabby feeling is gone. I say that to say, have you ever had an abdominal ultrasound?