Mysterious Illness. Throbbing back pain between shoulder blades, swollen stomach, nausea Can come in the middle of the night. Or in the daytime too. Can last a few minutes, or longer Than slowly subsides. Cardiologist checked all the coronary arteries said they were okay. Gastro doctor gave me an endoscopy and just found a little reflux. But he never said anything about the gallbladder or anything else?