I saw these quick tips on herbs:
Chew or brew into a tea to:
Expel gas - Aniseseed, parsley, dill, ginger, fennel
Stimulate digestion - Cinnamon, spearmint, cloves, nutmeg, peppermint
Soothe irritation - Flax, fenugreek
Relieve constipation - Dandelion root, rhubarb