What is the doctor gonna do honestly? Shove a camera up your a** and risk further more serious damage.
I've had blood come out with candida strands after ACV enemas, the candida embeds into the walls of your intestines, so when you pull it out there will be blood.
I'm not saying this is the case for you, everyone is different. I'll wait for UNY or someone more experienced to chime in, i just wanted to give you advice about the doctor thing.