Hi, for the past few months I've been severely constipated. I can't remember the last time I had a proper bowel movement. Instead of having bowel movement, I get lots of mucus and a decent amount of blood. Ever since it started, all I can hear and feel is the left side of my insides bubble. I'm trying to figure out what's wrong. Every doctor I've gone to have just told me to take laxatives but nothing works