Welcome to Healing Well! I think it's a good thing you're pursuing this diagnosis and getting things checked out. I'm sure your endoscopy will provide a lot of information and will provide you with answers. If your GI doc feels it would be helpful, there are other tests that can be done as well, like a 24hr PH monitor, which would measure the number of reflux episodes you have in an average day. Often a barium swallow is ordered as well. With nausea is a symptom, a stomach-emptying test might also be suggested.
Glad you've joined the forum! Be sure to let us know what you find out. I expect others will be by to comment and offer additional support.
Nissen Fundoplication 2/09
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”