I take 40-60 mgs of prilosec a day and it quells the reflux some but I still have it...before my diagnosis I began having 1-2 nights a week where I would wake up and vomit in the middle of the night and then feel terrible the entire next day. As far as me or my GI could tell this was just a result of acid reflux. I had an endoscopy bc he suspected I may have ulcers or something but I ended up having no ulcers just a "slightly irritated stomach lining" which I didnt think sounded like a very medical description of an ailment but anyway...YES, from my experience GERD can most def cause nausea and vomitting.