Bright red blood coming out of rectum for last two days?

No one on this site can tell you for sure what's wrong and losing that much blood a day is serious so you need to either call your Dr and let him/her know how bad it is or go to the ER. You don't want to have a transfusion if you don't have to but 10 times a day can cause a lot of blood loss. Call your Dr or go to the ER, don't wait.