I think you might be able to have the drain in at home. The drain line has to be flushed each day, but If you could get a nurse to visit you once a day should do it. My daughter was in the Hospital for 10 days with hers, but she was quite sick at the time. The fistula isn't necessarily likely, just thought you might ask about
that. Also, Flagyl does seem to be the antibiotic of choice for treating these. Good Luck with it.
My daughter was diagnosed Feb. 19/07, (13 yrs. old at time of diagnosis), with Crohn's of the Terminal Illium. Has used Prednisone and Pentasa. Started Imuran (02/09), had an abdominal abscess (12/08). 2cm of Stricture.