I had pains/stomach aches in the same spot,and had no other GI issues that weren't being addressed (and were different from this particular pain). My GI treated me for H. Pylori, and my stomach aches have decreased by 99%. I had no other symptoms of H. Pylori other than the unexplained, constant stomach ache. I still get a stomach ache from prolonged antibiotic use, or if I don't eat enough food with my Ursidoil several times in a row. I hope you feel better soon.
Also, have you been checked for GERD/acid reflux?