I have had back pain, in my shoulders like a pressure that kept building over about a month. Then my stomach started to have problems, nausea for no reason, sometimes it felt like I was punched in the stomach. Seemed to happen after meals, I went to the Dr he sent me for a sonogram of my galbladder, it came back with no stones. I then had an upper endoscopy, I was diagnosed with h pylori. Might me something to tell your Dr about.