Have any baking soda? Like a teaspoon in some water like 4oz of water then chug it is a quick fix that used to work for me (tastes absolutely disgusting though) . Oddly enough if that doesn't work, the opposite sometimes works; a tablespoon or so of vinegar, if you've been taking a lot of antacids. It blew my mind one time when i ate some vinegar and could actually instantly feel the relief spreading through my stomach