When bothered by GERD, I sometimes drink Ginger Beer (it's not alcoholic) or Ginger Tea.
Other teas which may help include Licorice, Chamomile, Slippery Elm, Marshmallow Root, Turmeric, and Fennel.
Also, supplements like Slippery Elm, Marshmallow Root, Aloe Vera, and Deglycyrrhizinated Licorice (DGL).
D-Limonene is a product that astroman has written about
extensively in many other posts.
Alka-Seltzer Gold may be another possibility.
A herbal blend I just learned about
when searching for ideas is
Iberogast.
I've read that 3-6 mg of Melatonin may be helpful for acid reflux, believe it or not.
While not for acute symptom relief, some long-term advice is to consider digestive enzyme such as Bromelain or Papaya with meals to support healthy digestion and reduce digestive discomfort after meals.
Other general support recommendations were a Probiotic, L-Glutamine, and Zinc Carnosine.