Thanks for sharing your query.
I have gone through your concern and it seems that the tooth which is paining and advised for root canal
is carious one and the treatment is started to remove the the pulp so bleeding occured in last appointment. bleeding in exess can be because of underlying infection or the medicine xareltto also causes unusual bleeding from wound.
I would advice you to consult her physician before stopping with the xareltto medicine and taking pain killer. As pain killers like Endone
can increase the bleeding.