Dude. last year for my birthday i had similar, passing blood in large quantities, it was a polyp that had turned cancerous, and they ALSO discovered a lesion in my small intestine that was cancerous, i lost some of the end of my small intestine and my ascending colon and they scraped the polyp and rectal wall out and i'm going for one year colonoscopy end of next month, then again i was 39 then, so its a better chance its haemorrhoids for you, so good luck that its something simple