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This has nothing to do with a vessel to the spine.
This is from a bleed in the stomach, or small intestine.
See your doctor right now, or be evaluated in the emergency room.
OK, so you might have more questions or want to give me more information: Please use reply to expert if you have further questions. When you are ready, please click a positive rating [hopefully excellent—that’s how we are paid, per rating]. If you forgot something, come back. I am here daily.
Did they start you on any new blood thinners or iron tablets?