You sound like you are having some type of serious gastrointestinal issues. There are an array of conditions and disorders that could cause blood to come out of the anus. To poor out though sounds very serious. You need to make an appointment with a specialist (if your insurance allows you to make direct appointments with them). If not, call your general practitioner and make a same day appt. to get some immediate help along with a referral.
Hope you get better and get some answers.
The blood is coming from somewhere. I would suggest that you make
a doctor's appointment as soon as possible, maybe even today.
This sounds very concerning. I wish you well. Eve
Please go to Dr right away.