tums no longer work ... And I need relief like now! Are their any foods that immediately help heartburn??

cup of cold milk

Mustard.... It's nasty but works

baking soda worked for me.

a 1/2 spoonful give or take dissolved in some warm water.... tastes rather salty but it worked almost immediately.

milk

A couple spoons of mustard, it'll hurt but helps so much! Or a cold glass or milk