I had RV fistulas for many years, which ended up being one of the reasons why I have an ileostomy today. I'll explain...
The fistulas ended up creating an abscess on my butt cheek, which was the most pain I've ever felt. It had to be surgically opened up, and the wound had to be left open to heal for several months.
I had to pack the wound with gauze that had a liquid antibiotic in it, so it wouldn't get infected. I also had to take a shower and clean the wound after every time I went to the bathroom. Well, with Crohn's, that can be up to 20 times a day. I couldn't sit, because it hurt so much, and I had to take pain medicine just to get through the day.
Well, the Crohn's flared up during this time, and my GI doctor, as well as my colorectal surgeon insisited that I get a temporary ileostomy to bypass the colon to let it rest and to let the wound heal. The wound did heal, but my colon didn't, so we ended up removing it and the rectum, since it was diseased, too. It wasn't until that surgery that I finally was done with the RV fistulas and the Crohn's flare ups.
Even though RV fistulas were miserable, in a roundabout way, they led me to where I am now, which is completely healthy and in a much better place than I was before.
Dx'd Crohn's in '99 at 28. Proctocolectomy & ileostomy in '06.
Pain-free, med-free, and very thankful to be healthy again :)