My GERD definitely gives me nausea (and pain) and upwards wind (belching).
People do seem to have a set of core symptoms, on top of which they may have other symptoms which are GERD related, drug related or the result of other problems such as gall bladder, irritable bowel and so on.
It can take a long time to fully understand your own "package" of GERD. I've had it 3 years and I'm still learning new things! It's best to persevere with the doctors and the tests so that causes can be found for symptoms that overlap with other conditions such as coeliac, Helicobacter, colitis and so on. It's a constant work in progress I'm afraid!
GERD (3 years and counting)
Lifelong stuff: Food allergies/intolerance, eczema, asthma