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With the symptoms that you are mentioning you most likely had an acute anal fissure.
By that I mean that you had a crack in the skin / mucous membrane in the anal opening.
The soreness at the bottom is something that goes strongly in favor of an acute anal fissure.
Having said that, any person who has bleeding like what you had should be evaluated and examined.
You will require an anoscopy (proctoscopy) to see and confirm the diagnosis.
Meanwhile for the sore anal opening you can use over-the-counter lignocaine gel which will numb the painful area.
Let me know if you have any further questions.
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