No,
IT is not a symptom of high blood pressure..
It can point to a cancer of the rectum, but that is a rare cause of this symptom
For a stomach infection the other symptoms could include fever, pain abdomen, vomiting, bodyaches etc. OF course none of these are necessary for the diagnosis..
Yes, You need to go to the doctor, preferably today... and the tests recommended would include a stool examination at the very least and an antibiotic prescription a(most likely) . If this has happened before or is happening for along time, then further tests maybe needed like a colonoscopy endoscopy etc., but that would depend on the clinical examination and detailed history
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Regards
Dr. Gupta