In my experience, bleeding is nearly always a sign of cuffitis. But, in a few cases it occurs with pouchitis (particularly C. difficile pouchitis). The treatment for cuffitis is mesalamine or hydrocortisone suppositories.
Also, you can have both pouchitis AND cuffitis. I know this, because I had them together before. I know they always warn you against alcohol and Flagyl (because it is chemically similar to Antabuse), but there are very few documented instances of the reaction in real life. Some people here have reported reactions. But, it is not dangerous. However, if you do react, it is a ptretty violent vomiting reaction, so not pleasant. It won't kill you, but you might wish it did!
As for myself, I am able to drink wine and liquor while taking Flagyl with no problems whatsoever! If you do have Flagyl prescribed, and do decide to experiment, be sure to do it at home, just in case.
Bottom line, time to call your doctor.
Jan