If you have heartburn more than twice a week it could be GERD or acid reflux. While I never had any of the common symptoms like heartburn, burping, gas, etc. I had a warm almost burning in the throat feeling every few hours that would go away with eating, some abdominal pain, pain under my ribs (both or alternating), etc. Dizziness, lightheartedness, and nausea are all symptoms of reflux. While I've never been officially diagnosed with reflux or GERD, I recently started taking Prevacid which is a common over the counter PPI used to treat GERD and reflux. It's a one pill a day for 14 days treatment, and while it says it takes from 24 hours to 4 days to see results, within 5 hours of taking my first pill I haven't had any of the symptoms that I've been having for almost 2 months now so it's something I'd consider looking into. Especially if something like Rolaids or Tums helps you feel better.