About a day ago I notice a large amount of bright red blood in my stool all of a sudden. I felt fine afterwards, not dizzy or sick and I'm thinking its most likely hemorrhoids because my doctor diagnosed me with them a few years ago, however back then there would only be a little amount of blood. This time its almost like it flows with the bowel movement. The next day it was the same... I was wondering if this was a verry serious problem and if I should see my doctor immediatly or if it could just be a raptured hemorrhoid. Also, I'm pretty young (20 yrs old female).