I have been having stomach cramps vomiting and going to the bathroom about every 30 min. To an hour. My diarriah is also a dark brown color.?

See below. It sounds as if you've come down with acute gastroenteritis, a common, nonlife threatening condition of the GI tract. Take nothing orally for the next 6 hours, then try clear liquids. If you keep those down, eat what you feel hungry for. If you can't, see your doctor.