Oh, boy. It sounds like you are going through the same thing as my daughter, who's 21. I wish she would get on this site. She's had this abcess for almost a year. It is actually on or in her buttocks and she hasn't been able to sit comfortably for most of this time. Friday she had surgery again, now she has 3 cton drains in. But the surgeon did irrigate the abcess and I'm hoping that this time it will heal. She's on Flagyl again and sees the surgeon again on Monday - I'm just praying that she gets some relief soon.
Her discharge was yellow, clear, bloody and now it is mostly bloody and not new blood either so I hope that's a good sign. She is supposed to go back to work later today. She uses the biggest, actually longest, menstrual pads she can find.
Good luck and I pray you heal quickly and with as little pain as possible.