Blend all the herbs together and use to make a soothing herbal tea. 1 teaspoon per cup of water or 3 Tbsp. per quart of water. Let steep for 10 minutes or so and then drink as is or add some raw honey to sweeten. Optionally you can also add a couple of stevia leaves to sweeten.
Even though I call this Heartburn Blend, the herbs in it is suited for any type of indigestion. It works best when taken as a tea so that it can run down the digestive tract, coating and soothing as it goes. Marshmallow is very soothing to all mucous membranes. Chamomile is a great digestive aid and pain reliever. The mint family is cooling, Catnip particularly helps with cramping and spasms. Fennel seed is one of the best digestive aids, acting as an antacid. Calendula is very healing and will work to fix any damage caused by stomach acid gone wild.