Hi Liz. First off, breath. Where do you get the idea that you have a fistula? The barium x-ray that you had before your takedown surgery should have detected one if it was there. This could and possible is, just a vaginal infection of some sort. The watery stool and many of them are both common with early days of j pouch life. I agree with Scott that maybe call the surgeon's office or email, whichever you feel more comfortable with and see if they can move your appointment up a bit, or if they have any advise the could help you in the mean time. Please do not stress, things are a bit wonky for a time with a new j pouch, but this could be nothing to do with your pouch. Good luck and please keep us informed on what you find out.
Aimee