If your stomach problems are this persistent after trying various remedies, etc, then you may need to consider further testing. Missing something serious because you want to avoid testing could be costly. It is always good to try and avoid some of the medical intervention (invasive procedures etc) first. I understand not want to scope frequently. How long has it been since your last GI scope? If the last one was normal I would doubt something horrible just popped up in a short time.

The GI track is a complex system with many possible problems that can occur...that can share similar symptoms. What does your GI suggest at this point? Does he have any ideas?