A combination of 1 part laundry detergent (powder), 1 part sugar, and enough water to make a poultice will reduce swelling in sprains.
Rubbing the space between your thumb and index finger will help soothe a toothache.
Have a headache? From the bone spur at the back of your neck measure up three fingers onto the neck apply steady direct pressure to the nerve bundle between the tendons. It relaxes the nerve center and allows more blood flow to the brain.
Every year as soon as my peppermint comes in, I'll cold infuse a gallon of vinegar. Great for taking the heat out of sunburns. I'll apply it directly to the skin or add to bath water.
Have a food poisoning? A mixture of lemon verbena, ginger, and peppermint made into a tea will stop the vomiting, stomach cramps, and the gas.
I don't know if this has already been posted, but in our family, we eat a spoonful of peanut butter to cure hiccups. It works every time!