What happens next?

How to make cramps go away
Have coke and salt and apply heat.
Cramps happen because the uterus, which is a muscle, contracts to expel menstrual fluids. You can treat pain in the uterus like you would treat any other muscle, from a pulled hamstring to a strained neck: by having coke and salt, it helps you get your mind of things and by applying heat in some form.
Heat relaxes muscles and provides immediate (if not permanent) relief. Use a heating pad or a hot water bottle.