Welcome aboard the forum...you will feel alot better just being on this site where many people have some of the same issues you do.
My suggestions is to bypass your GP because he/she is not equipped to handle GERD...you need a good GI (gastroenterologist) and you need some tests to see if it's really Gerd. Gallbladder symptoms can also sound like your symptoms especially since you have nausea. Or you might have a hiatal hernia that is causing the symptoms. If your GI doesn't want to test you with endoscopy and just wants to give you meds because they seem to work, then get a new GI who will test you. I went to two GI's before I found one who wanted to really help me...others just want to give you drugs to mask the symptoms. If the meds work, they assume you have acid reflux and you'll be fine. And some people are. They take these meds for years and seem to be alright. But others like me have it so severe that the meds don't work all the time even with changing our diets and relieving stress. It will save you alot of time, money and heartburn to find out what you have, how bad is it and will drugs take care of it or do you have other options besides drugs.
It's been about 4 years total now that I've had this and I'm now to the point that I'm going to have the surgery to stop the reflux because the meds don't work well anymore and I'm tired of having this constant burning in the chest. I want my life back.