I had severe dizziness initially from GERD. My aunt (not blood relative so it's not genetic) also had it. I was sent for a brain MRI and she had to go thru many tests for her heart. All turned out to be GERD.
I was on Prilosec for 1 month and had a rebound effect before I was actually able to wean myself off so I just stopped taking it. I'm now on an alkaline diet and control almost all the symptoms with DGL licorice, slippery elm and aloe vera gel.