Good luck with everything! My pouch was >25 yrs old when it was removed in oct., and I had 2 fistulas. My fistulas have no more drainage, which is wonderful. I don't really even need to use pads anymore. I was stitched on the inside of my backside, and there was an opening left for drainage for the big fistula.
My surgery was 3-1/2 hrs, also involved adhesion removal and stoma revision. I had a pouch disconnect 1 year earlier, with an end ileostomy, adhesions were removed during that surgery as well. I had open surgery with a tap block both times, which worked really, really well to control pain for about 2-3 days after the surgery, then the pain set in, but I had a patient controlled analgesic (button I could press with dilaudid) which was very helpful. I was out in 5 days with oxycodone for pain, but had to go back 4 days later due to ileus and what turned out to be gastritis. Just something kind of quirky that happens to me when I've had intestinal surgery.
I hope it all goes well for you, I'll be sending positive thoughts your way. Keep us updated when you can.