Hi there -
This is a little too far down the GI tract to be picked up by endoscopy. While you may have GERD this is something else. It could be as simple as ordinary gas (air) getting trapped in or around the splanchnic flexure of the large intestine, but if over-the-counter meds intended to dissipate gas don't relieve this then you may need a colonoscopy to determine just what's going on in there. This could also, of course, be gynecological in nature, but you'd likely have other symptoms as well that would point that way. You'll need to see the gastroenterologist again most likely, to figure out what exactly is going on. Since you've already had h.pylori and were treated for it, and since that usually colonizes the upper GI tract (stomach mostly), that's probably not what's going on.
Hopefully another GI consult will clear this up for you. Please follow up with us here.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist