I just answered your question about endoscopy in another post......but in case you don't see it, I'll say it again here. It's my understanding that an endoscopy will show any damage from GERD, but if it is normal, it doesn't mean you don't have it. My endoscopy was normal........but I still had a diagnosis of GERD, based on clinical symptoms. Maybe you have a hiatal hernia? The docs say those don't bother you, but I'm convinced they do. And they can come and go ("sliding" hiatal hernia).
You could read up on yeast overgrowth, and try a diet for awhile, that would cut down on your yeast. Also, try to eat alot of yogurt, and take an acidophilus pill every day. I would suggest you read up on how to heal your GI track. Most docs don't believe in "Leaky Gut syndrome", but I believe in it. Try to read up on that, and see if you think it fits you.
Have you been reading Dr. Norm's posts on carbohydrates, as culprits in GERD? You could try cutting down on those and see if it helps. I just think you have alot of healing to do.
And I just can't saw it enough, that female hormones can cause these problems. I think they have an effect on the tone of our muscles, and end up giving us really bad reflux.
I also think it's smart to try different proton pump inhibitors, if one doesn't seem to work well. Aciphex isn't very well known, but it worked wonders for me. I suppose you already know to avoid caffeine, chocolate, tomato products, etc.?
Did the doctors ever wonder about h. Pylorii? I think they can even do just a blood test for that.
Not to scare you, but ovarian cancer can have alot of GI symptoms......so you might ask your OB/GYN about that.
Sometimes, the doctors don't find anything wrong, which can be very frustrating. But sometimes, you can figure out ways to change certain things, and make your life more liveable.