Oregano is usually thought of as a culinary herb, but it has been used medicinally for thousands of years.  Try a Tea made with Oregano for indigestion, bloating, flatulence, coughs, urinary problems, bronchial problems, headaches, swollen glands, and to promote menstruation.   It has also been used in the past to relieve fevers, diarrhea, vomiting, and jaundice.  Unsweetened tea can be used as a gargle or mouthwash.  Alternatively, the leaves can be dried, pulverized, and made into capsule form for when it is inconvenient to make a tea.  Please see the link below for details.  At this point in time, there have not been enough studies done to refute or to support any of the above claims, but Oregano is a safe herb for testing at home, so feel free to experiment.

Externally, Oregano leaves can be pounded into a paste (add small amounts of hot water or tea to reach the desired consistency - oatmeal may also be added for consistency purposes).  This paste can then be used for pain from rheumatism, swelling, itching, aching muscles, and sores.   For tired joints and muscles, put a handful of Oregano leaves in a coffee filter, mesh bag, or cheesecloth bag and run steaming bath water over it.  Allow it to steep in the tub with you as you relax in the warm, fragrant water. 

Lastly, an Oil can be made with Oregano leaves to use for toothache pain.  Put a few drops on the affected tooth for relief.