Flax gruel:
Soak freshly ground flaxseed - 3 tablespoons / 500 ml water overnight. Boil briefly, sieve the excess water in a close-meshed kitchen sieve or cloth made of linen. Squeeze the solid through the cloth or strainer and remove from the outside with a spoon. Drink in sips.
Works even if resistant to the sometimes controversial PPI, no side effects.