In your case, the bleeding is likely to be from hemorrhoids, or piles. This is a fairly benign condition, treatment options include both surgery and conservative methods.
However, there are many causes of rectal bleeding. Since you are an alcoholic, this may also lead to GIT bleeding. You need to consult your doctor for an examination and investigations if they are needed. This is necessary for you to find out the cause of your bleeding and for appropriate treatment, whether it is piles or anything else.
You can read up about piles or hemorrhoids here:
http://www.cnn.com/HEALTH/library/DS/00096.html
Causes of rectal bleeding here.
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