There is a strong possibility that you will require surgery, since there is bleeding going on somewhere in your gastrointestinal tract. It most certainly calls for a physical examination and diagnosis. There are new scanning methods and swallowed-miniature-camera methods that may let you avoid an unpleasant colonoscopy, but by all means see a doctor.
http://www.cancer.gov/clinicaltrials/results/virtual-colonoscopy1203
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